Email Authentication Setup for Cold Email: What You Actually Need

Quoted on this wiki

Every place a page here uses this source, in the order the words come in it.

1. What's specific to cold email “Use dedicated sending domains so a deliverability problem doesn't touch your main domain's reputation.” Where SPF tends to go wrong for cold senders

   In Sending domains and mailboxes

2. What's specific to cold email “Authentication and warm-up are separate problems that both need solving.” Where SPF tends to go wrong for cold senders

   In Sending domains and mailboxes

3. The non-negotiables “Three records, in this order: SPF — tells receiving servers which sources are authorized to send for your domain DKIM — cryptographically signs your messages so they can't be altered in transit without detection DMARC — sets the enforcement policy for what happens when SPF or DKIM fail, and gives you reporting visibility” What's specific to cold email

   In Sending domains and mailboxes

4. What's specific to cold email “Multiple domains, not one — sending volume gets spread across several domains and mailboxes rather than concentrated on one, which is standard for anyscalable cold email infrastructure .” Where SPF tends to go wrong for cold senders

   In Sending domains and mailboxes

5. What's specific to cold email “Warm-up before volume — a fully authenticated domain still needs to build sending reputation gradually.” Where SPF tends to go wrong for cold senders

   In Sending domains and mailboxes

6. Where SPF tends to go wrong for cold senders “Go past ten lookups and the record fails entirely, silently.” Verifying it's actually working

   In Sending domains and mailboxes