Deliverability is the foundation of cold email success. If your emails don't reach the inbox, nothing else matters — not your copy, not your offer, not your follow-up sequence.
This guide covers everything you need to know about keeping your cold emails out of spam.
What Is Email Deliverability?
Email deliverability is the ability to land in your recipient's primary inbox (not spam, not promotions). It's determined by your sender reputation, email authentication, content quality, and sending patterns.
The Authentication Trinity: SPF, DKIM, DMARC
SPF (Sender Policy Framework)
SPF tells receiving servers which IP addresses are authorized to send email on behalf of your domain. Without it, anyone could spoof your domain.
Setup: Add a TXT record to your DNS that lists authorized senders.
DKIM (DomainKeys Identified Mail)
DKIM adds a digital signature to your emails, proving they haven't been tampered with in transit.
Setup: Generate a key pair and publish the public key as a DNS TXT record.
DMARC (Domain-based Message Authentication)
DMARC tells receivers what to do with emails that fail SPF or DKIM checks.
Setup: Start with p=none to monitor, then move to p=quarantine or p=reject.
Domain Warm-Up Strategy
New domains have no reputation. You need to build trust gradually:
- Week 1: 10-15 emails/day to engaged contacts
- Week 2: 25-40 emails/day
- Week 3: 50-75 emails/day
- Week 4+: Scale to your target volume
Sender Rotation
Distribute your sending volume across multiple mailboxes to avoid any single mailbox carrying too much load. ClickReach's auto sender rotation handles this automatically — just connect your mailboxes and the system distributes sends evenly.
Content Best Practices
- Avoid spam trigger words ("guaranteed", "act now", "limited time")
- Keep HTML simple or send plain text
- Don't include too many links (1-2 max)
- Use spintax to avoid identical content patterns
- Always include a real signature
Monitoring Deliverability
Track your bounce rate closely. If it exceeds 5%, pause and clean your list. In ClickReach, bounces are detected automatically via IMAP monitoring, and the system auto-stops sequences for bounced contacts.
