- SPF record
- Most important, make sure to add both the ipv4 and ipv6 of your server!!
- Use -all at the end of your record!
- DKIM will enhance delivery, however SPF will give you the most gain in delivery success.
- DMARC is an extra record which can improve even more, but it's gain in delivery success is less than SPF and DKIM.
- However it's quite important from a security point of view (avoid abuse by external parties).
- The most basic DMARC txt record to create, which will enforce SPF: v=DMARC1; p=reject; aspf=s;
- In doubt: Always use https://www.mail-tester.com/
- Make sure that you use the exact same method as the one your experience problems with when sending the mail to mail-tester.
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