SPF contains an invalid IPv4 address
URGENTWhat it means
the offending value is not a valid IPv4 address, so it authorises nothing, and strict receivers treat the malformed term as a permanent error for the whole record.
How to fix it
Correct the offending value to a valid address or range, e.g. ip4:203.0.113.10 or ip4:203.0.113.0/24
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 5.6. 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_INVALID_IPV4
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.