Thanks everyone for the advice. For the immediate future I am going to continue to send to Gmail only over IPv4. After I have some confidence that I have checked all the boxes for our IPv6 IPs I will do some experimental sending to Gmail from those IPs. If I can achieve reliable delivery I will consider removing the IPv4 only config. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
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