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I did all the domain checks and everything is checking out fine. SPF and reverse DNS are all correct.
"Remote server returned '550 5.4.300 Message expired -> 421 4.7.28 [2a01:111:f403:7052::701 15] Our system has detected an unusual;rate of unsolicited mail originating from your IP address. To;protect our users from spam, mail sent from your IP address has been;temporarily rate limited. Please visit; https://support.google.com/mail/?p=UnsolicitedRateLimitError to"
Is there a problem on the MS IP addresses right now?
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Benjamin
It began working last night! Don't think I have something quite correct in the CNAME but I have a whole lot better education on what this problem is and how to deal with it thanks to you. Thank you again!
We have had SPF and DKIM for a very long time. Sadly that is not enough to solve our gmail rate-limiting false positives.
Microsoft & Google - get this fixed ASAP; you corporate goofballs.
Have you put in the DMARC record and CNAME also?
I am no mail admin by any stretch of the imagination, so through this community's help and some of my own research, have come to learn this is not a MS or Google problem per se. It is Google applying the agreed upon outbound mail standard because there are so many bad guys out there trying to invade our computers, The scenarios in this thread and particularly ones suggested by Benjamin are just setting our outbound mail up to be more secure. We use GoDaddy for our domain, so I've had to call on them also, but if you want this working, it is up to us to fix our systems to the approved standards.