Brute force attempts into my mailserver?

[Old_Grey_Wolf]

I am looking at the auth.log as well. I don't see any activities within those timeframe of attacks. They weren't successful if there were no entries?

I don't think you have been compromised.

Here is a sticky from the Security sub-forum that you may want to read http://ubuntuforums.org/showthread.php?t=510812. Although it is old, it has some good links on how to detect intrusions.

[CharlesA]

I don't think you have been compromised.

Here is a sticky from the Security sub-forum that you may want to read http://ubuntuforums.org/showthread.php?t=510812. It has some good links for detecting intrusions.

The link in my sig has some basics too.

[Old_Grey_Wolf]

The link in my sig has some basics too.

Nice guide! =D>
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[duceduc]

Thanks guys for the info.