Email authentication tells receiving systems that your mail is actually coming from the domain it claims to come from.
That matters because even a well-targeted campaign looks less trustworthy when authentication is weak.
SPF
SPF defines which senders are allowed to send on behalf of your domain.
DKIM
DKIM adds a cryptographic signature so receiving systems can verify the message was not altered.
DMARC
DMARC tells receiving systems how to handle messages that fail authentication and helps you monitor what is happening.
BIMI
BIMI is the branding-oriented layer that can display your logo in supported inbox experiences, but it depends on stronger authentication foundations.
Why this matters alongside list cleaning
Authentication and list hygiene solve different problems:
- authentication helps prove the sender is legitimate
- list cleaning helps prove the recipients are worth sending to
You want both.
Clean the list while you tighten delivery fundamentals on MailCull →