Topic: Errors from SMTP
after some days of use, my users noticed two recurring errors from SMTP server:
This is an exampe of the first one:
"This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
(ultimately generated from firstname.lastname@example.org)
SMTP error from remote mail server after RCPT
host mail.firstdomain.com [xxx.xxx.xxx.xxx]: 553 5.7.1
Sender address rejected: not logged in"
Some explanation: aliasdomain.com is an external domain (shared host server) that forward all mail to the corresponding account of my server. Both firstdomain.com and seconddomain.com are set as virtual domain of my server. This error occurs when a user with an account on my server try to send an email to an extarnal address which forward to another address of my server.
The second error:
" The mail system
<email@example.com>: lost connection with
mail.provider.it[126.96.36.199] while performing the HELO handshake
<firstname.lastname@example.org>: lost connection with
mail.provider.it[188.8.131.52] while performing the HELO handshake"
The same error occurr with domains other than domain.it, but all seems to be hosted by "provider.it". Do you think there is something similar to a blacklist?
Thanks in advance