Extras

Verifying that SPF and DKIM are working

To verify that SPF and DKIM are working on mail sent from your self hosted e-mail setup, send a test mail to a Gmail account.

Go to the received mail on Gmail (check spam as it may be there), and click the three dots on the top right, then click Show original:

This will open a page which contains the raw content of the sent mail. At the top of the page there is a header with information, including details about whether the sent mail passed SPF, DKIM and DMARC checks:

Make sure that all of these are marked as PASS.

How to stop mail from your server being marked as spam

Verifying that SPF and DKIM are working correctly (see above) is a good first step to ensuring mail from your server is not marked as spam. However it is not the end-all-be-all, as even email which passes SPF, DKIM and DMARC checks can still be marked as spam.

What can you do if this is happening to mail sent from your server?