Thanks everybody! It's odd. Some messages are getting through. It's just this particular domain and MTA. Other domains and other mail servers are not having any issues sending to gmail..com.
Intermittent DNS failures are always a possibility. We have a 3rd party DNS/HTTP/SMTP monitor, which hasn't complained. Our DNS servers are used by many other domains so we hear complaints when there are issues. The DMARC issue is a possibility, since it coincides with their switchover month. This particular domain is a personal domain, which isn't sending 5,000+ messages a day so it's not covered by their bulk sender DMARC requirement. We have another domain that goes through to gmail.com just fine from the same MTA. Neither have DMARC or DKIM, both have SPF. Adding DKIM/DMARC is in our queue. Perhaps it's time to accelerate that. :) Yes, removing _spf.google.com is a good idea. Thanks for pointing that out. Also remove "a mx ipv4" redundancy. Thanks. Thanks, Rob
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