On 25 Jul 2022, at 11:00, Laura Atkins via mailop wrote: >> In the current state of affairs, ESPs presume they know more than the >> receivers, so they keep trying to send. Since the ESPs essentially disregard >> the 5xx codes using the line of reasoning that you described, > > The ESPs are not disregarding the 5xx. They’re actively respecting it, and > not attempting a second delivery of the message that received the 5xx.
Of that message, sure. A new message from the same sender will be attempted. A new message from a different sender will also be attempted. With the current state of affairs, a steady stream of 550 5.7.1 responses does not guarantee that the ESP will stop sending to the email address. This scenario is untenable, regardless of which party wants to keep it as is. Best regards -lem _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
