SPF record exceeds a single DNS string
ATTENTIONWhat it means
The record is N bytes. A DNS text string tops out at 255, so it must be published as several quoted strings, and DNS panels that get this wrong truncate or mangle the record.
How to fix it
Publish the record as multiple quoted strings inside one TXT record, split on a space between mechanisms, and re-check it after saving.
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 3.3. 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_RECORD_STRING_TOO_LONG
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.