An a mechanism points at a name with no address
ATTENTIONWhat it means
example.net has no A or AAAA record, so this mechanism authorises nothing and burns one of the two void lookups a record is allowed.
How to fix it
Give example.net an address record, or remove the mechanism if the host is gone.
Check your own domain
This page describes the condition. To find out whether your domain has it, run the SPF test or the full checkup, which examines every record at once.
Understand it properly
This page covers one condition. For the whole picture, What is SPF, and the ten-lookup limit, or start at the Health Library.
Where this comes from
We judge this against RFC 7208 section 5.3. Every finding on this site cites the specification behind it so you can check the work rather than take our word for it.
Other SPF conditions
SPF_A_TARGET_VOID
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.