E-mail deliverability

What the findings of the e-mail check mean and how to fix them. The topics follow the categories of the report.

Authentication Infrastructure and transport Reputation Compliance Brand

Authentication

What SPF does

SPF defines which servers may send mail with your domain as the sender. Receivers can tell mail that comes from servers of strangers.

What DKIM does

DKIM adds a digital signature to every mail. Receivers can tell that the mail really comes from your domain and was not changed on the way.

What DMARC does

DMARC tells receivers what to do with mail that claims to come from your domain but fails SPF and DKIM. In return you get reports on who sends in your name.

Infrastructure and transport

What MTA-STS and TLS-RPT do

MTA-STS makes sure mail to your domain is delivered only encrypted and only to your real mail servers. TLS-RPT tells you when that fails.

Reputation

What blocklists are

Blocklists hold IP addresses and domains that spam came from. If you are on one, many receivers reject your mail or sort it into spam.

Compliance

What bulk senders must do

Gmail, Yahoo and Microsoft require senders of many mails to have SPF, DKIM, DMARC and one-click unsubscribe. If something is missing, mail lands in spam or is rejected.

Brand

What BIMI does

With BIMI, mailboxes such as Gmail, Yahoo and Apple Mail show your logo next to your mails. It requires a strict DMARC policy.

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