Disclaimer: Platform pricing, contact database sizes, and deliverability benchmarks referenced in this article are based on publicly available information and user-reported data as of April 2026. Cold email and outbound platforms update their pricing and features frequently. Always verify current details directly with each vendor before making a purchase decision.
Affiliate disclosure: Some links in this article are affiliate links. If you purchase through these links, Automaiva may earn a commission at no additional cost to you. Our recommendations are based on independent research and real-world testing. We do not accept payment for placement in our comparisons.
The Cold Email Stack Confusion — Solved
Most comparison articles treat Clay, Apollo, Instantly, and Smartlead as if they compete for the same job. They do not. Clay is a data enrichment and personalization engine — it does not send emails. Apollo is a prospect database with a built-in sequencer — it does both jobs adequately but neither one best-in-class. Instantly is a sending platform built for volume and deliverability at flat-fee pricing — it does not find your leads. Smartlead is a high-volume sending infrastructure with mailbox rotation — built for agencies and technical teams running thousands of sequences simultaneously. The B2B SaaS founders who get cold email right in 2026 are not picking one tool from this list. They are understanding which layer of the stack each tool owns — and building accordingly. Figures based on aggregated user-reported data and may not reflect all team experiences.
Your first cold email campaign probably looked like this: export a CSV from Apollo, paste it into a sequence tool, hit send, watch the open rates, wonder why nobody replied, blame the copy.
The copy was fine. The infrastructure was broken.
In 2026, cold email deliverability is harder than it has ever been. Google and Microsoft have tightened inbox filtering. Reply rates have dropped industry-wide as inboxes grew more competitive. The SaaS founders generating consistent outbound pipeline are not sending more emails — they are sending better-targeted emails from healthier domains with personalization that makes the recipient think the email was written specifically for them. Because it was.
This guide breaks down exactly what Clay, Apollo, Instantly, and Smartlead each do, where each one fits in a functioning B2B SaaS outbound stack, and how to build a stack from these four tools that generates pipeline without burning your sending domains in the first 30 days.
About this guide: The Automaiva team evaluated cold email and outbound platforms used by B2B SaaS teams from seed stage through Series A. All pricing is sourced directly from vendor websites as of April 2026. Deliverability benchmarks are drawn from independent third-party audits and user-reported data.
Table of Contents
- Understanding the 3 Layers of a Cold Email Stack
- Quick Comparison: What Each Tool Actually Does
- Clay — Best for AI-Powered Enrichment and Hyper-Personalization
- Apollo — Best All-in-One for Teams That Want One Tool
- Instantly — Best Sending Platform for Growing SaaS Teams
- Smartlead — Best for High-Volume Technical Teams and Agencies
- How to Build Your Outbound Stack: 4 Configurations by Stage
- Deliverability in 2026: The Rules That Changed Everything
- Hidden Costs Nobody Mentions in the Comparison Articles
- Frequently Asked Questions
Understanding the 3 Layers of a Cold Email Stack
The single biggest mistake B2B SaaS founders make with cold email is treating it as a one-tool problem. Every high-performing outbound system in 2026 has three distinct layers — and confusing which tool owns which layer is the fastest way to burn your domains, waste your budget, and generate no pipeline.
Layer 1: Data and enrichment. Finding the right people to contact, verifying their email addresses, and enriching each contact with enough context to write a personalized first line. Tools in this layer: Clay, Apollo (data side), ZoomInfo, Clearbit. The output of this layer is a verified, enriched contact list ready for a sequence.
Layer 2: Personalization and sequencing. Writing the outreach — either manually, with AI assistance, or at scale using enrichment data — and building the multi-step sequence that sends emails, tracks replies, and routes responses. Tools in this layer: Apollo (sequence side), Instantly, Smartlead, Lemlist. Clay also contributes here through its AI personalization engine before handing off to a sending tool.
Layer 3: Infrastructure and deliverability. The sending domains, email warmup, mailbox rotation, and technical configuration (SPF, DKIM, DMARC) that determines whether your emails reach the primary inbox or the spam folder. Tools in this layer: Instantly and Smartlead both have warmup built in. Google Workspace and Microsoft 365 are the underlying email providers for most SaaS outbound teams.
Original insight: B2B SaaS teams that separate their enrichment layer (Clay or Apollo data) from their sending layer (Instantly or Smartlead) consistently report higher reply rates than teams using a single all-in-one tool for both functions. The reason is specialization — enrichment-first tools build better contact data, and dedicated sending tools maintain better deliverability infrastructure. The tradeoff is stack complexity. The right choice depends on your team’s technical capacity and monthly outbound volume. Figures based on aggregated user-reported data and may not reflect all team experiences.
Quick Comparison: What Each Tool Actually Does
| Feature | Clay | Apollo | Instantly | Smartlead |
|---|---|---|---|---|
| Primary function | Enrichment + AI personalization | Prospecting database + sequencer | Email sending + deliverability | High-volume sending infrastructure |
| Sends emails | No — exports to sending tool | Yes | Yes | Yes |
| Contact database | No native database | 275M+ B2B contacts | 160M+ (newer, growing) | No native database |
| AI personalization | Best-in-class — per-row AI at scale | Basic AI email drafting | Basic personalization variables | Custom variable fields |
| Email warmup built in | N/A | Yes | Yes — Unibox warmup network | Yes — built-in warmup |
| Mailbox rotation | N/A | Limited | Unlimited accounts | Unlimited rotation |
| Pricing model | Credit-based (per row enriched) | Per seat per month | Flat fee (unlimited accounts) | Flat fee (by leads/mailboxes) |
| Starting price | Free (limited credits) / $149/month | Free / $49/user/month | $30/month | $39/month |
| Best for | Enrichment + hyper-personalization at scale | All-in-one for small teams | Growing SaaS teams, flat-fee sending | Agencies, technical teams, high volume |
| Technical skill required | High — steep learning curve | Low — accessible to non-technical | Low to medium | Medium to high |
Clay — Best for AI-Powered Enrichment and Hyper-Personalization at Scale
Clay is the best B2B SaaS outbound enrichment tool because it pulls data from 75-plus sources simultaneously — LinkedIn, Crunchbase, Clearbit, Apollo, and dozens more — runs AI-generated personalization against every row, and exports a campaign-ready contact list to your sending tool of choice. It does not send emails. Understanding this distinction is the prerequisite for using Clay correctly.
✓ Pros
- Waterfall enrichment across 75-plus data sources — fills gaps automatically when one source returns incomplete data
- AI agent runs per-row personalization at scale — generates unique first lines based on LinkedIn activity, recent funding, job changes, or any enriched field
- Connects natively to Instantly, Smartlead, Apollo, HubSpot, and Salesforce — no manual CSV export required
- Intent signal integration — surfaces contacts showing buying signals from G2, Bombora, or web visitor data
- Free plan available — limited credits but enough to validate whether Clay improves your personalization quality before committing
- Replaces four to six separate enrichment tools with one workflow — ZoomInfo, Clearbit, Hunter, and Crunchbase data in a single table
✗ Cons
- Steepest learning curve on this list — most founders need 10 to 20 hours to build their first functional Clay table
- Credit-based pricing is difficult to predict — costs scale with enrichment volume and can spike unexpectedly on large lists
- Does not send emails — requires a separate sending tool, which adds cost and complexity to the stack
- AI personalization quality depends on data quality — poor LinkedIn profiles or sparse company data produce generic outputs
- Overkill for SaaS teams sending fewer than 500 emails per month — the complexity is not worth the investment at low volume
Pricing: Free plan with 100 credits per month. Starter at $149/month for 2,000 credits. Explorer at $349/month for 10,000 credits. Pro at $800/month for 50,000 credits. Credits are consumed per enrichment action — one row enriched from five sources costs five credits, not one. See current Clay pricing →
Who should not use Clay: Pre-seed founders sending fewer than 300 emails per month — the credit cost and learning curve do not justify the investment at that volume. Teams without a dedicated sending tool — Clay outputs a list, not a campaign. You still need Instantly or Smartlead to send. Teams that need a simple, fast outbound motion without a technical operator — Apollo’s all-in-one approach ships faster.
Try Clay Free →
Free trial terms and availability vary by plan. Confirm current offer details on the vendor’s website.
Apollo — Best All-in-One for Teams That Want One Tool
Apollo is the best all-in-one outbound platform for B2B SaaS teams that want a single tool covering prospecting, enrichment, sequencing, and basic CRM — because its 275M-plus contact database, built-in email sequencer, and free plan make it the fastest path from zero to first cold email sent without managing multiple vendor relationships or technical integrations.
✓ Pros
- 275M-plus verified B2B contacts with job title, company, industry, and intent signal filters
- Built-in email sequencer — prospect, enrich, and send from the same platform without exporting a CSV
- Generous free plan — 10 export credits per month with basic sequencing and CRM functionality
- Intent data built in — surfaces accounts researching your category on G2 and third-party review sites
- LinkedIn extension — enrich and add contacts directly from LinkedIn profiles without leaving the browser
- Native HubSpot and Salesforce integration — syncs contact and sequence data bidirectionally
✗ Cons
- Per-seat pricing penalizes team growth — adding a second sales rep doubles the cost immediately
- Data quality is inconsistent for smaller companies and non-US markets — email bounce rates can be high on niche lists
- Sending infrastructure is less robust than Instantly or Smartlead — limited mailbox rotation and warmup capability
- Sequence logic is linear — limited conditional branching compared to dedicated sending platforms
- At scale, combining Apollo’s per-seat cost with its sequence limitations makes it more expensive per booked meeting than a Clay plus Instantly stack
Pricing: Free plan with 10 export credits per month. Basic at $49/user/month (annual) for 1,200 export credits and full sequencing. Professional at $79/user/month for unlimited exports and advanced filters. Organization at $119/user/month adds advanced security and custom permissions. See current Apollo pricing →
The Apollo sweet spot for SaaS: A solo founder or a two-person sales team running 200 to 500 outbound emails per week who needs one tool to cover prospecting and sequencing without a dedicated ops resource. Apollo’s free plan validates outbound as a channel before committing to paid infrastructure. Its paid plan is the most cost-effective all-in-one option for teams that are not yet ready to manage a multi-tool stack.
Who should not use Apollo as their primary sending tool: Teams sending more than 1,000 emails per week — Instantly’s flat-fee model is cheaper and its sending infrastructure is more robust at that volume. Teams that need hyper-personalized first lines at scale — Clay’s AI personalization engine produces significantly better output than Apollo’s built-in AI drafting. Teams hiring multiple sales reps — per-seat pricing makes Apollo expensive fast once headcount grows.
Try Apollo Free →
Free trial terms and availability vary by plan. Confirm current offer details on the vendor’s website.
Instantly — Best Sending Platform for Growing B2B SaaS Teams
Instantly is the best cold email sending platform for growing B2B SaaS teams because its flat-fee pricing model covers unlimited sending accounts and unlimited warmup — meaning your cost does not increase as you add mailboxes, rotate domains, or scale sending volume — making it the most cost-predictable sending infrastructure for teams past the validation stage.
✓ Pros
- Flat-fee pricing with unlimited sending accounts — add ten mailboxes or fifty, the price does not change
- Built-in warmup network — new sending domains reach inbox-ready status faster than manual warmup processes
- Unibox — a unified inbox that consolidates replies from all sending accounts in one view for easy management
- Clean, intuitive interface — non-technical founders set up their first campaign in under an hour
- AI reply categorization — automatically sorts replies into interested, not interested, and out-of-office categories
- Built-in B2B lead database (160M-plus contacts) — growing in coverage and useful for founders who want one fewer tool
✗ Cons
- Native lead database is newer and less comprehensive than Apollo’s 275M-plus contacts — better as a supplement than a primary source
- Sequence logic is less sophisticated than Smartlead for complex multi-branch campaigns
- No native CRM — replies and booked meetings need to be synced to HubSpot or Pipedrive via Zapier or native integration
- Reporting and analytics are adequate but not as granular as Smartlead for agency-level campaign tracking
- API access limited on lower-tier plans — technical teams that need deep API integration may hit constraints
Pricing: Growth at $30/month for 1,000 active leads and 5,000 emails per month. Hypergrowth at $77.6/month for 25,000 active leads and 100,000 emails per month. Light Speed at $286.3/month for 500,000 emails per month. All plans include unlimited sending accounts and warmup. Lead finder database is a separate add-on. See current Instantly pricing →
Who should not use Instantly: Agencies managing five or more client accounts with strict separation requirements — Smartlead’s multi-client workspace architecture is cleaner for that use case. Teams that need advanced API access for custom workflow integrations — Smartlead’s API-first infrastructure handles this better. Teams doing fewer than 200 emails per week — Apollo’s all-in-one approach is more cost-effective at that volume.
Try Instantly Free →
Free trial terms and availability vary by plan. Confirm current offer details on the vendor’s website.
Smartlead — Best for High-Volume Technical Teams and Agencies
Smartlead is the best cold email sending platform for technical B2B SaaS teams and agencies running high-volume outbound because its API-first architecture, multi-client workspace model, and unlimited mailbox rotation give teams that have outgrown simpler tools the infrastructure control that inbox placement at scale requires.
✓ Pros
- API-first architecture — deep webhook and API integrations let technical teams build custom outbound workflows and automation pipelines
- Multi-client workspace — separate sending domains, sequences, and reporting per client with clean account isolation
- Unlimited mailbox rotation — spread sending volume across as many accounts as needed with automatic daily limit management
- Advanced campaign analytics — granular per-mailbox and per-sequence reporting that agencies need for client reporting
- Built-in warmup with reputation monitoring — tracks sender score across mailboxes and alerts before domain health degrades
- Native Clay integration — import enriched and personalized contact lists from Clay directly without CSV handling
✗ Cons
- Interface is less polished than Instantly — steeper onboarding for non-technical users
- Pricing scales by leads and mailboxes — can become more expensive than Instantly at high sending volumes
- No native contact database — you need Apollo or Clay to source and enrich contacts before importing
- Overkill for solo founders or two-person teams — complexity and cost are not justified under 1,000 emails per week
- Customer support response times vary on lower-tier plans — enterprise support requires higher-tier commitment
Pricing: Basic at $39/month for 2,000 active leads and unlimited email accounts. Pro at $79/month for 30,000 active leads. Custom plans for agencies and high-volume teams. All plans include unlimited mailboxes and built-in warmup. See current Smartlead pricing →
Who should not use Smartlead: Founders doing outbound themselves for the first time — Instantly’s cleaner interface and faster onboarding are better for the first 90 days. Teams that need a built-in contact database — Smartlead assumes you already have quality input data and does not help you find it. Teams that want a simple, one-tool outbound stack without technical configuration — Apollo handles that use case better at lower volume.
Try Smartlead Free →
Free trial terms and availability vary by plan. Confirm current offer details on the vendor’s website.
How to Build Your Outbound Stack: 4 Configurations by Stage
The right outbound stack is not the one with the most tools. It is the one that matches your current sending volume, your team’s technical capacity, and your budget. Here are the four configurations B2B SaaS teams actually use, in order of complexity.
Configuration 1: The Solo Founder Stack — Validate Before You Invest
Tools: Apollo free plan only.
Monthly cost: $0.
Best for: Pre-seed founders sending fewer than 100 emails per week to validate that cold email generates any response before investing in infrastructure.
Limitation: Apollo’s free plan export credits are limited. Deliverability on Apollo’s shared sending infrastructure is adequate but not optimized for scale. Use this configuration to prove the channel works, then upgrade.
Configuration 2: The Early-Stage Stack — Ship Fast and Stay Lean
Tools: Apollo paid (data and light sequencing) plus Instantly Growth (dedicated sending and warmup).
Monthly cost: $49 to $79 (Apollo) plus $30 (Instantly) = approximately $79 to $109/month.
Best for: Seed-stage SaaS teams sending 200 to 1,000 emails per week with one or two people running outbound. Apollo finds and qualifies the leads. Instantly handles sending from warmed domains with rotation.
Why this beats Apollo alone: Dedicated sending domains on Instantly consistently outperform Apollo’s shared sending infrastructure on primary inbox placement. The $30 Instantly subscription pays for itself within the first month on improved deliverability alone.
Configuration 3: The Growth Stack — Personalization at Scale
Tools: Clay (enrichment and AI personalization) plus Instantly Hypergrowth (high-volume sending).
Monthly cost: $149 to $349 (Clay) plus $77.60 (Instantly) = approximately $226 to $426/month.
Best for: Series A SaaS teams sending 1,000-plus emails per week with a dedicated growth or sales ops resource who can manage Clay workflows. Clay generates hyper-personalized first lines from LinkedIn activity, recent funding rounds, job changes, and other enrichment signals. Instantly handles the sending infrastructure.
The personalization dividend: Teams using Clay-generated personalization alongside Instantly’s sending infrastructure report reply rates of 6 to 10 percent on well-targeted lists — two to three times the industry average for generic cold email. The additional monthly cost of Clay pays back within the first 10 meetings booked. Figures based on aggregated user-reported data and may not reflect all team experiences.
Configuration 4: The Technical Team Stack — Maximum Control
Tools: Clay (enrichment) plus Smartlead Pro (high-volume sending with API control).
Monthly cost: $349 (Clay Explorer) plus $79 (Smartlead Pro) = approximately $428/month.
Best for: Technical SaaS teams or agencies running multiple campaigns simultaneously, needing API-level control over sending behavior, or managing outbound for more than one product line or client. Smartlead’s native Clay integration removes the CSV export step — enriched contacts flow directly from Clay into active Smartlead campaigns.
When to choose this over Configuration 3: When your team has a developer who can use Smartlead’s API to automate campaign creation, contact import, and reply handling — removing manual steps that cost ops time at scale.
Deliverability in 2026: The Rules That Changed Everything
Deliverability is where most cold email advice from 2023 and 2024 became outdated. Google and Microsoft tightened inbox filtering significantly in 2025 and early 2026. The non-negotiable technical requirements for reaching the primary inbox have changed — and teams still sending from unwarmed domains without proper authentication are generating spam folder impressions, not pipeline.
The four technical requirements that are now mandatory, not optional:
SPF (Sender Policy Framework): Your DNS record must authorize the mail servers you use to send email on behalf of your domain. Without a valid SPF record, Google and Microsoft classify your emails as suspicious before they reach the inbox filter. Instantly and Smartlead both provide setup guides — this is a 10-minute configuration task that many founders skip and then blame on deliverability.
DKIM (DomainKeys Identified Mail): Cryptographically signs your outgoing emails to verify they were sent from an authorized source. Required alongside SPF for consistent primary inbox placement. Both Instantly and Smartlead configure DKIM automatically for connected mailboxes.
DMARC (Domain-based Message Authentication): Tells receiving mail servers what to do with emails that fail SPF or DKIM checks. A basic DMARC policy set to “none” takes five minutes to configure and is now an expected signal for legitimate senders. Google explicitly recommends DMARC for bulk senders as of 2024.
Domain warmup: New sending domains need 3 to 4 weeks of gradually increasing send volume before running cold outreach campaigns. Instantly and Smartlead both include warmup networks that automate this process. Skipping warmup on a new domain and sending 500 cold emails on day one is the single fastest way to get a domain blacklisted permanently.
Original insight — the domain-per-campaign rule: The highest-performing B2B SaaS outbound teams in 2026 use dedicated sending domains for cold outreach — never their primary company domain. A sending domain like outreach-companyname.com or hello-companyname.com is disposable if deliverability degrades. Your primary domain (companyname.com) is not. Protecting your primary domain from cold email sending is the first deliverability decision every SaaS founder should make, before evaluating any sending platform. Figures based on aggregated user-reported data and may not reflect all team experiences.
Hidden Costs Nobody Mentions in the Comparison Articles
Every platform on this list has costs that do not appear on the pricing page. These are the four that consistently surprise B2B SaaS teams six weeks after they start running campaigns.
Hidden cost 1: Sending domains and Google Workspace seats. Every sending domain requires a Google Workspace or Microsoft 365 account to send from. Google Workspace costs $6 to $18 per user per month. If your Instantly or Smartlead stack uses 10 sending domains, each needing its own Google Workspace account, that is $60 to $180 per month in email infrastructure costs before you pay for the sending platform. Most comparison articles ignore this entirely.
Hidden cost 2: Clay credit overruns. Clay’s credit system charges per enrichment action, not per contact. Enriching 1,000 contacts across five data sources costs 5,000 credits — not 1,000. Teams that build ambitious Clay tables without calculating credit consumption upfront hit their monthly credit limit within the first week and face either a plan upgrade or a paused campaign. Calculate credits per row before building your Clay workflow.
Hidden cost 3: Apollo export limit frustration. Apollo’s Basic plan includes 1,200 export credits per month. A campaign targeting 300 contacts per week exhausts those credits within the first week of the month. The remaining three weeks require manual prospecting or a plan upgrade. Teams that size their Apollo plan based on sending volume rather than export volume consistently hit this wall.
Hidden cost 4: Deliverability recovery time. If a sending domain gets flagged or blacklisted — from sending too fast, skipping warmup, or high bounce rates from poor data — recovery takes 4 to 8 weeks of dormancy before the domain is usable again. During that window, outbound pipeline goes quiet. The cost is not financial — it is the pipeline gap while you rebuild domain reputation. Buying additional sending domains and running parallel warmup cycles is the mitigation strategy, not the cure.
Pricing note: All pricing information for Clay, Apollo, Instantly, and Smartlead is accurate as of April 2026. These platforms update their pricing tiers and feature availability regularly. Always verify current pricing on each vendor’s official website before making a purchase decision.
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Frequently Asked Questions
Does Clay send cold emails?
No. Clay is a data enrichment and AI personalization platform — it does not send emails. Clay pulls contact data from 75-plus sources, generates personalized first lines using AI, and exports the finished contact list to a sending tool like Instantly or Smartlead. Confusing Clay with a sending tool is the most common misunderstanding in B2B SaaS outbound. If you are looking for a tool that both finds contacts and sends emails, Apollo or Instantly with its built-in lead database are the better starting points.
What is the difference between Instantly and Smartlead?
Both are cold email sending platforms with flat-fee pricing, unlimited mailboxes, and built-in warmup. The key differences: Instantly has a cleaner interface and is faster to set up for non-technical users. Smartlead has a more powerful API and a multi-client workspace model that is better for agencies managing multiple accounts. At equivalent sending volumes, Instantly is typically cheaper. At high volume with complex API automation requirements, Smartlead’s infrastructure gives more control. Most B2B SaaS startups at seed and early growth stage find Instantly sufficient — Smartlead becomes relevant when you have a developer building custom outbound workflows or you are running outbound for multiple products simultaneously.
Is Apollo good enough for cold email sending, or do I need Instantly?
Apollo is adequate for cold email sending at low volume — fewer than 500 emails per week from a single mailbox. Its built-in sequencer covers the basics and avoids the need for a separate sending tool at early stage. At higher volumes, Apollo’s sending infrastructure trails Instantly and Smartlead on mailbox rotation, warmup capability, and inbox placement rates. The practical recommendation: start on Apollo to validate outbound as a channel. Add Instantly for dedicated sending infrastructure once you are consistently sending more than 500 emails per week and want to protect your sending domains.
How many sending domains do I need for cold email?
A common rule of thumb is one sending domain per 30 to 50 emails sent per day. A team sending 200 emails per day needs four to six sending domains, each with its own Google Workspace or Microsoft 365 account. Spreading volume across multiple domains protects against a single domain blacklisting shutting down your entire outbound operation. Both Instantly and Smartlead manage multi-domain rotation automatically once you connect the accounts.
What cold email reply rate should a B2B SaaS team expect in 2026?
Industry benchmarks for cold email reply rates in 2026 sit between 1 and 4 percent for generic, low-personalization campaigns targeting large lists. Teams using hyper-personalized first lines generated from Clay enrichment and well-segmented targeting typically report 5 to 10 percent reply rates on focused lists of 50 to 300 highly qualified prospects. Volume is not the lever — relevance and targeting precision are. A team sending 100 highly personalized emails to perfectly matched ICP accounts will generate more pipeline than a team sending 1,000 generic emails to a broad list. Figures based on aggregated user-reported data and may not reflect all team experiences.
Can I use Clay with Apollo instead of Instantly or Smartlead?
Yes. Clay enriches and personalizes your contact list, then exports it to Apollo’s sequencer for sending. This stack works and is common among teams already using Apollo for their contact database. The tradeoff: Apollo’s sending infrastructure has less mailbox rotation and warmup capability than Instantly or Smartlead. If deliverability is a priority — which it should be for any team sending more than 300 emails per week — routing Clay output through Instantly or Smartlead rather than Apollo’s sequencer typically produces better inbox placement results.
What happens if my cold email domain gets blacklisted?
A blacklisted sending domain stops reaching the primary inbox and may trigger spam filters across all major email providers. Recovery requires taking the domain offline from all sending activity for 4 to 8 weeks while its reputation decays from the blacklist. During that window, your outbound pipeline from that domain goes to zero. The mitigation is prevention: always warm new domains for 3 to 4 weeks before sending cold outreach, never send more than 30 to 50 emails per day per domain, monitor bounce rates and stop campaigns immediately if bounce rates exceed 3 percent, and never use your primary company domain for cold outreach sending.
Written by the Automaiva Editorial Team