On 1/7/22 11:24 PM, Ken Wright wrote:
My Dovecot issues continue. Right now I see at least two issues:
first, my logs consistently show non-users trying (and failing) to log
in, and I'm still unable to log in from my email client (Evolution or
Roundcube, either one).
I'll post about the second issue later; right now I wonder why I'm
getting so many non-users trying to log in. Am I the subject of
concerted hacking attacks, or is there something else going on? Some
of the attempted logins are more-or-less random names claiming to be
@mydomain, but at least one is a username that's really on my server,
to wit:
Jan 7 22:52:01 grace dovecot: lmtp(776281): Error: lmtp-server: conn
unix:pid=776262,uid=117 [3]: rcpt [email protected]: Failed to
lookup user [email protected]: Internal error occurred. Refer to
server log for more information.
(Another quick question: which server log should I check?)
So, if anyone can tell me what's going on with all these logins, I'd be
much obliged!
I see them all the time on the mail servers I run. Typical kids
trying to mess with other peoples' stuff. I run fail2ban to catch those
log entries and block the source IP address for a month on the first
failed login. At any one time I have between 12,000 and 15,000
addresses in my blocked list for IMAP.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
