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A checklist for creating a “mailout” server with DKIM and SPF

Create the DKIM DNS Record:

Create the SPF Record:

Do not forget to add a PTR record at your provider!

Verify the settings:

Authentication Checker

Use this command:

mail -r -s 'testerl vom roman'

And some more information if your domain is hosting email at Google:

Update 2018-01-25: Update port25 authentication checker URL