> First thing I did was stop Postfix. Turns out it was listening on all
> interfaces, instead of just "lo". Fixed.
>
> Now, I need to figure out how I was broken in to. I don't see any holes in
> the firewall, and root login is disabled through ssh.
How about eliminating the most likely possibility first. Have you
determined that port 25 was not open in the firewall? And that your
postfix is not configured as a relay?
~ Daniel
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