Update for the Checklist on “mailout” servers

This is an update to the checklist to create a prefect mailout server:
Original Checklist

Setup DMARC DNS Record to receive mail delivery reports
https://www.unlocktheinbox.com/dmarcwizard/

btw: I Just started adding all those settings to my own domain too. Google DKIM signing is still waiting for DNS propagation.

• dns
• email
• exim
• linux
• mail
• networking
• sysadmin