On Sun, May 17, 2026, Dan Mahoney via mailop wrote: > And, bonus, I get longer reports because proofpoint tries all six of > the internal gmail mxes, with mixed 45X and 50X responses.
> ... while talking to alt1.aspmx.l.google.com.: > >>> DATA > <<< 450-4.2.1 The user you are trying to contact is receiving mail at a rate > that .... > <<< 450 4.2.1 https://support.google.com/mail/?p=ReceivingRate > 46e09a7af769-7e55b801ff8si5191570a34.44 - gsmtp > <<< 503-5.5.1 RCPT first. A mail transaction protocol command was issued out > of .... That looks like a normal result from PIPELINING: RCPT To:... DATA and then the server sends a 4xy for the only RCPT and hence a 5xy for DATA because there is no valid RCPT. Looks like there is nothing wrong with this behaviour, right? -- Please don't Cc: me, use only the list for replies, even if the mailing list software screws up the Reply-To header. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
