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rmmsteve

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We recently kept getting these messages in our security logs:

[19/Nov/2010 08:27:56] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:00] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:04] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:04] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:28:35] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:40] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:44] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:28:44] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:29:15] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:29:19] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:29:23] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:29:23] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:29:54] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:29:58] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:30:03] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:30:03] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:30:33] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:30:38] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:30:42] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:30:42] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:31:13] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:31:17] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:31:22] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:31:22] SMTP server connection from 76.77.80.154 closed after 3 bad commands
[19/Nov/2010 08:31:52] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:31:57] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:32:01] Failed SMTP login from 76.77.80.154
[19/Nov/2010 08:32:01] SMTP server connection from 76.77.80.154 closed after 3 bad commands

I tried

  • Adding a custom blacklist of spammer IP addresses.
  • Removing the IP from Allow relay only for users from IP address group
  •  
TorW

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Karma: 9
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I may be wrong, but I think the activity (in the log snippet you posted) happens too early in the SMTP dialogue to be caught by the custom blacklist. The reason is probably that Kerio eventually wants to throw a meaningful error message instead of just blocking outright. You may have to use a firewall to block.
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