SMTP auth bruteforce attacks seen / 2022-03-05

2022-03-05 SMTP auth bruteforce attacks seen
Cybercriminal In checking recent logs I noticed several tries to find SMTP authentication credentials. Most notably is that anything that vaguely resembles something that might be an SMTP account is tried. Including plussed e-mail addresses and information from SIP urls.
Mar  5 14:12:09 gosper saslauthd[16336]:                 : auth failure: [user=8006] [service=smtp] [realm=idefix.net] [mech=pam] [reason=PAM auth error]
Mar  5 17:15:00 gosper saslauthd[16339]:                 : auth failure: [user=koos+web] [service=smtp] [realm=idefix.net] [mech=pam] [reason=PAM auth error]
Mar  5 18:08:04 gosper saslauthd[16339]:                 : auth failure: [user=belspel] [service=smtp] [realm=idefix.net] [mech=pam] [reason=PAM auth error]

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IPv6 check

Running test...
, reachable as koos+website@idefix.net. PGP encrypted e-mail preferred. PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers

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