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Full Cold Email Course: Everything You Need to Know About Infrastructure & Deliverability (2026)
Alex Zartarian
Overview
This course provides a comprehensive guide to the technical aspects of cold email infrastructure and deliverability, aiming to help users land emails in the primary inbox. It breaks down complex concepts like DNS settings, domain management, inbox setup, and warm-up processes. The video emphasizes understanding the 'why' behind each component to avoid common pitfalls and marketing noise. It guides viewers through planning sending volume, selecting domains and inboxes, configuring technical settings, and managing campaigns long-term, stressing that a solid technical foundation is crucial for successful cold outreach, even more so than copywriting or list building alone.
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Chapters
- Cold email deliverability is crucial for reaching the primary inbox, and understanding its technical components is key to success.
- This course focuses solely on the technical aspects, not scriptwriting or list building.
- The goal is to demystify common terms and filter out misleading information often pushed by vendors.
- A well-structured technical infrastructure is the foundation for effective cold email campaigns.
Understanding the core concepts of infrastructure and deliverability allows you to make informed decisions, avoid costly mistakes, and navigate the complex cold email landscape effectively.
The speaker highlights that many people use terms like 'infrastructure' and 'deliverability' without truly understanding their meaning, leading to confusion and ineffective strategies.
- Infrastructure encompasses all elements that enable an email to travel from sender to recipient's inbox, including domains, email accounts, DNS records, warm-up processes, sequencers, lead lists, and scripts.
- Deliverability is the outcome: successfully landing emails in the primary inbox, distinct from infrastructure which is the cause.
- Emails can bounce (never reach the server), land in spam, or land in promotions, all of which are deliverability issues, but the goal is the primary inbox.
- Infrastructure is the cause, deliverability is the result; good infrastructure leads to good deliverability.
Clearly defining these terms prevents confusion and ensures you are addressing the right components when troubleshooting or optimizing your cold email setup.
A bounced email means the address doesn't exist and never reached the recipient's mail server, whereas an email in the spam folder reached the server but was flagged as unwanted.
- Before setting up anything technical, determine your monthly sending volume, as this dictates the number of domains and inboxes needed.
- Each email account has a safe sending limit of 15 emails per day after a ramp-up period.
- Never send cold emails from your primary business domain; use separate, lookalike domains for cold outreach.
- Reliable domain registrars like GoDaddy, Porkbun, or Namecheap can be used; .com, .info, .co, and .net domains are acceptable, but avoid sketchy-looking ones.
Properly planning your volume and using dedicated domains prevents your primary business reputation from being damaged and ensures you have the necessary resources for your sending goals.
To send 30,000 emails/month, you need approximately 91 email accounts and 31 domains, calculated by dividing the monthly goal by sending days, then by daily limits per account, and then by accounts per domain.
- Essential DNS records (MX, SPF, DKIM, DMARC) authenticate your emails and direct them correctly, though inbox resellers often handle this setup.
- Domains have a limited lifespan in cold email, typically degrading after 9-10 months, requiring a rotation schedule.
- When domains renew, you can either renew them at the original registrar or port them to a cheaper one to save costs.
- Understanding DNS records is important for troubleshooting even if an inbox reseller manages them.
Correct DNS configuration is vital for email authentication, and planning for domain lifespan ensures continuous sending capability without unexpected disruptions.
SPF (Sender Policy Framework) is a text record that authorizes specific servers to send email from your domain, preventing spoofing.
- Google is currently outperforming Microsoft for cold email deliverability.
- Adopt an 'insurance policy' mindset: allocate the majority of your sending budget to the best-performing provider (currently Google) and use a smaller portion for fallback accounts on another platform (e.g., Microsoft or SMTP).
- Set up two to three email accounts per domain for cost-efficiency and to avoid looking unusual to receiving servers.
- Use personal names for email addresses (e.g., john@domain.com, not sales@domain.com) and ensure a human-like profile picture, display name, and simple signature.
This strategy maximizes your sending performance by leveraging the best provider while maintaining a backup, ensuring resilience and cost-effectiveness.
Instead of a 50/50 split between Google and Microsoft, use 80% of your accounts with Google and 20% with Microsoft as a backup, ensuring your primary sending volume benefits from the better-performing platform.
- Email warm-up involves sending small numbers of emails from new accounts to other warmed-up accounts to build a track record of normal conversation activity.
- Warm-up should ideally last for 14 days, sending around 15 warm-up emails per day.
- Many sequencers and inbox resellers have integrated warm-up processes, simplifying the setup.
- Keep warm-up enabled even after launching campaigns to maintain a high reputation score, especially if outbound engagement is low.
A proper warm-up builds a positive sending reputation, significantly increasing the chances of your emails landing in the primary inbox once you start live campaigns.
Think of warm-up like building a credit score before applying for a loan; a good history of email conversations makes your account more trustworthy to mail servers.
- A sequencer is essential for automating cold email sending, managing follow-ups, and tracking campaign metrics.
- Popular sequencers include Smart Lead, Instantly, and Email Bison; the choice matters less than other technical components.
- Emails should be spaced out (e.g., 20 minutes apart) to avoid triggering suspicious activity.
- Sequencers consolidate domains, inboxes, lists, and copy for campaign launch and monitoring.
The sequencer is the central hub for executing your cold email strategy, enabling efficient sending, follow-ups, and performance analysis.
When sending 15 emails per day from an account, space them out with at least a 20-minute gap between each email, rather than sending them all at once.
Key takeaways
- Cold email success hinges on a robust technical infrastructure, which is the cause of good deliverability (the effect).
- Never use your primary business domain for cold outreach; always use dedicated, lookalike domains.
- An 'insurance policy' approach to inbox providers, prioritizing the best performer while maintaining a backup, maximizes efficiency and resilience.
- Warm-up is a critical reputation-building process that should not be skipped and should continue even during live campaigns.
- While copywriting and list building are important, they are secondary to a solid technical foundation for deliverability.
- Understanding the fundamentals of each technical component empowers you to make informed decisions and avoid falling prey to marketing hype.
- Using inbox resellers simplifies complex technical setups like DNS configuration and warm-up, reducing the risk of errors.
Key terms
InfrastructureDeliverabilityPrimary InboxDNS RecordsSPFDKIMDMARCDomain LifespanInbox ResellerWarm-upSequencerLookalike Domains
Test your understanding
- What is the fundamental difference between cold email infrastructure and deliverability, and why is this distinction important?
- How does planning your sending volume influence the number of domains and email accounts you need?
- Why is it crucial to use separate, lookalike domains for cold email instead of your primary business domain?
- Explain the 'insurance policy' mindset for setting up email accounts and how it differs from a 50/50 split between providers.
- What is the purpose of the email warm-up process, and why should it continue even after live campaigns have started?