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Hello community,
we asked our users to update their email address.
Now we still get error messages mailer daemon with for example:
Quote:This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 48 hours on the queue on serveur.xxx.xx.

The message identifier is:    1jHORI-0004YN-Ql
The date of the message is:    Thu, 26 Mar 2020 09:04:36 +0000
The subject of the message is: =?UTF-8?B?Tm91dmVsbGUgcsOpcG9uc2Ugc3VyIFN5c3TDqG1lIEQ=?=

The address to which the message has not yet been delivered is:

  [email protected]
    host mx-eu.mail.am0.yahoodns.net [xxx.xx.xxxx]
    Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=2832:
    421 4.7.0 [TSS04] Messages from xxx.x..xxx.. temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLNxxx.html

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.

This user updated his email address this morning and informed me. Why am I still getting these error messages?

THX in advance for your help!
blongso