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Home » Kerio User Forums » Kerio Connect » it seems my email server is under attach, any suggestion?

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Last night, a lot of emails come from or go to web<_a.t_>, obviously they are not from my clients. It seems someone break in and use my SMTP server, see the mail log below. My SMTP setting is relay for local IPs or User authenticated through SMTP for outgoing mail. I am not sure how they break in there, and I don;t see any client account in the log. Any idea? thanks

[05/Oct/2008 22:09:17] Recv: Queue-ID: 48e99d7c-0001e4de, Service: SMTP, From: <web<_a.t_>>, To: <sales<_a.t_>>, Size: 1036, Sender-Host:, User: support<_a.t_>[mydomain].com
[05/Oct/2008 22:09:18] Sent: Queue-ID: 48e99d78-0001e4dc, Recipient: <njb1441<_a.t_>>, Result: relayed, Status: 2.0.0
[05/Oct/2008 22:09:18] Recv: Queue-ID: 48e99d7e-0001e4df, Service: DSN, From: <>, To: <web<_a.t_>>, Size: 1859, Report: failed
[05/Oct/2008 22:09:18] Sent: Queue-ID: 48e99d7a-0001e4dd, Recipient: <<_a.t_>>, Result: failed, Status: 5.1.1 550 ** No mail box available for this user **
[05/Oct/2008 22:09:23] Sent: Queue-ID: 48e99d7e-0001e4df, Recipient: <web<_a.t_>>, Result: failed, Status: 5.1.1 550-5.1.1 The email account that you tried to reach does not exist. Please
[05/Oct/2008 22:09:23] 550-5.1.1 try double-checking the recipient's email address for typos
[05/Oct/2008 22:09:23] 550-5.1.1 or unnecessary spaces. Learn more at
[05/Oct/2008 22:09:23] 550 5.1.1 30si11663133wfa.10

Pavel Dobry (Kerio)

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Change the password for user support<_a.t_>[mydomain].com and use more complex password to make it hard for guessing.
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