I just noticed that one of my webmail accounts has sent 100s of spam emails (through the web mail interface I believe since there was a template there). Running Plesk 8.1.1, Horde About says it's version is "This is Imp H3 (4.1.3)". I'm not sure what version of Horde overall I have. I'm 99% sure they did not get the password for this account. I can't figure out what exploit they used (there are ton a listed in Security Focus). So, in short: How to I figure out what happened? How do I stop it from happening again? (How do I upgrade horde and imp)? Thanks in advance.