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maxfontana

Messages: 49
Karma: 0
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Hi. On 2 xp clients using Thunderbird as mail client via IMAP connection, every day my security log is fulfilled with the messages below mentioned. What could cause this warning? Users are working without troubles...
Thanks in advance.
Max
Italy

[05/Mar/2008 08:04:30] Failed SMTP login from 10.0.0.99
[05/Mar/2008 08:06:26] Failed SMTP login from 10.0.0.99
[05/Mar/2008 09:09:42] Failed SMTP login from 10.0.0.99
[05/Mar/2008 09:15:10] Failed SMTP login from 10.0.0.99
[05/Mar/2008 09:47:17] Failed SMTP login from 10.0.0.38
[05/Mar/2008 09:58:56] Failed SMTP login from 10.0.0.99
[05/Mar/2008 10:02:00] Failed SMTP login from 10.0.0.38
[05/Mar/2008 10:35:27] Failed SMTP login from 10.0.0.38
[05/Mar/2008 11:21:28] Failed SMTP login from 10.0.0.38
[05/Mar/2008 12:22:00] Failed SMTP login from 10.0.0.99
[05/Mar/2008 14:21:41] Failed SMTP login from 10.0.0.38
[05/Mar/2008 14:25:02] Failed SMTP login from 10.0.0.38
[05/Mar/2008 14:26:49] Failed SMTP login from 10.0.0.38
[05/Mar/2008 14:30:20] Failed SMTP login from 10.0.0.38
[05/Mar/2008 14:30:37] Failed SMTP login from 10.0.0.38
[05/Mar/2008 14:35:45] Failed SMTP login from 10.0.0.38
[05/Mar/2008 15:06:33] Failed SMTP login from 10.0.0.99
[05/Mar/2008 16:35:05] Failed SMTP login from 10.0.0.99
[05/Mar/2008 16:49:05] Failed SMTP login from 10.0.0.99
[05/Mar/2008 16:50:42] Failed SMTP login from 10.0.0.99
[05/Mar/2008 16:58:46] Failed SMTP login from 10.0.0.99
[05/Mar/2008 17:22:01] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:23:24] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:24:57] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:25:15] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:34:40] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:35:33] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:36:25] Failed SMTP login from 10.0.0.38
[05/Mar/2008 17:45:51] Failed SMTP login from 10.0.0.99
[05/Mar/2008 17:49:12] Failed SMTP login from 10.0.0.38
[05/Mar/2008 18:08:38] Failed SMTP login from 10.0.0.38
[06/Mar/2008 11:02:38] Failed SMTP login from 10.0.0.99
[06/Mar/2008 11:17:12] Failed SMTP login from 10.0.0.38
[06/Mar/2008 11:25:54] Failed SMTP login from 10.0.0.38
[06/Mar/2008 12:55:32] Failed SMTP login from 10.0.0.99
[06/Mar/2008 14:12:03] Failed SMTP login from 10.0.0.38
[06/Mar/2008 14:20:35] Failed SMTP login from 10.0.0.99
[06/Mar/2008 14:35:49] Failed SMTP login from 10.0.0.38
[06/Mar/2008 14:36:05] Failed SMTP login from 10.0.0.38
[06/Mar/2008 14:41:01] Failed SMTP login from 10.0.0.38
[06/Mar/2008 15:06:12] Failed SMTP login from 10.0.0.99
[06/Mar/2008 16:00:55] Failed SMTP login from 10.0.0.99
[06/Mar/2008 16:39:14] Failed SMTP login from 10.0.0.99
[06/Mar/2008 16:43:51] Failed SMTP login from 10.0.0.99
  •  
sedell

Messages: 1168
Karma: 1
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Enable SMTPS and authentication in the debug log to get more details. You'll be able to see the communications between the server and client. The warning log may provide more info on the failed logins, but not always.

It could be that the programs are defaulting to an unsupported authentication method, which fails, before trying a supported one which succeeds and sends the users mail. I've seen this happen before, and it's usually transparent to the user since they can get and send their mail, and they aren't seeing any error dialogs.

Scott
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