Hi Mark, thanks for helping me out. Just an update about my mail server problem. I noticed that my www-data is the one sending out ALOT of stuff which I think is spam. Dunno why it's doing that. I remembered before that someone was able to hijack our servers by installing Medusa. I immediately removed it, but I think it was too late because that was the time that all these mess started to happen..being blacklisted, server sending spam, etc. If I reinstall again, can you tell me what are the "security" that I need to ensure in my new installation so it won't happen again? Thanks in advance.