Record Generator
List the servers allowed to send as your domain, without blowing the lookup budget.
How to use this
It will argue with you
Asking for p=reject with no reporting address gets you an error, not a record. The generator that quietly emits whatever you asked for is how domains break their own mail.
Order matters more than syntax
DMARC at none with reporting, then read reports for a few weeks, then quarantine, then reject. Every step you skip, you find out about from a customer.
The records nobody mentions
External reporting addresses need an authorisation record in the other domain. MTA-STS needs a hostname and a hosted file. We list those alongside the main record rather than leaving you to find out later.
Then check it
A record that is right in the form and wrong in DNS is common — providers mangle quoting, split strings, or append the zone name. Verify with the lookup tools after publishing.