> Finally, FWIW, gmx has now unlocked my original account and now I have two gmx accounts.
Now they are both locked again after re-testing the sends. Similar to before but this time 20 messages sent OK. On MAIL TO for message 21, got 451 error (mails per session limit exceeded) and I had changed the code so that any 4xx would make a new connection on the same "client" and retry the failed message send. But all the additional attempts to send failed with 550 "mailbox unavailable" during RCPT TO phase.
Bug 1854567 Comment 33 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
> Finally, FWIW, gmx has now unlocked my original account and now I have two gmx accounts.
Now they are both locked again after re-testing the sends. Similar to before but this time 20 messages sent OK. On MAIL FROM for message 21, got 451 error (mails per session limit exceeded) and I had changed the code so that any 4xx would make a new connection on the same "client" and retry the failed message send. But all the additional attempts to send failed with 550 "mailbox unavailable" during RCPT TO phase.