DMARC fails using custom domain with Sendy, messages marked as spam

Question

I use Sendy in a custom domain. So far, so good: validated the custom domain via email in Sendy and I can send messages.

But it fails to pass DMARC, which triggers this horrendous message in Proton, Gmail, plus send messages to spam folder.

Here's a mail-tester: https://www.mail-tester.com/test-pkc3siz78&reloaded=1

Any idea how to fix this?

Answer 1

I just had this exact same problem this week using Sendy. To solve the problem, make sure to have all of these configured correctly:

DKIM: https://docs.aws.amazon.com/ses/latest/dg/send-email-authentication-dkim-easy.html

SPF: https://docs.aws.amazon.com/ses/latest/dg/send-email-authentication-spf.html

DMARC: https://docs.aws.amazon.com/ses/latest/dg/send-email-authentication-dmarc.html

MAIL FROM: https://docs.aws.amazon.com/ses/latest/dg/mail-from.html

And the final step to make it work is to make sure that you have the DKIM signatures: Enabled for the verified email identity.

The Identities are found in: SES -> Configuration -> Verified Identities Then to enable the DKIM signatures navigate to the auth tab and click on edit:

DKIM verification status