Fix guides
DKIM Setup and Fix Guides
Fix DKIM signature failures, key strength issues, and provider-specific DKIM setup — with exact DNS record values.
SendGrid DKIM
CNAME records for SendGrid domain authentication.
Google Workspace DKIM
Generate and publish Google DKIM keys.
Microsoft 365 DKIM
Enable and rotate selector1/selector2.
Key Length
Move from 1024-bit to 2048-bit keys.
Signature Failed
Debug body hash and header canonicalization.
Selector Setup
Choose and publish the right selector.
Key Rotation
Rotate DKIM without delivery gaps.
Subdomain DKIM
Signing from subdomains vs root domain.