Poor deliverability is almost always preventable. Here's the complete pre-send checklist.
Authentication
- ☑ SPF valid, under 10 lookups
- ☑ DKIM signing active (2048-bit)
- ☑ DMARC published (p=quarantine minimum)
- ☑ PTR record matches sending domain
Reputation
- ☑ Not blacklisted (MXToolbox check)
- ☑ Gmail domain reputation Medium or High
- ☑ Warmup complete for new domains
- ☑ Sending from dedicated IP
List Quality
- ☑ List verified in last 30 days
- ☑ Hard bounces from last campaign removed
- ☑ Unsubscribes processed
- ☑ No purchased or harvested addresses
- ☑ Inactives (6+ months) removed or suppressed
Content
- ☑ Subject line under 50 chars, no trigger words
- ☑ 60%+ text-to-image ratio
- ☑ Plain text version included
- ☑ Unsubscribe link functional
- ☑ Physical address present (CAN-SPAM)
Testing
- ☑ Seed list test (Gmail, Outlook, Yahoo)
- ☑ SpamAssassin score below 3.0
- ☑ Renders correctly on mobile
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