Hi, all. I went though the Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail and everything seems to work fine. My setup should be exactly the same as the howto. It's a great howto. Even though everthing is working fine, email sending and recieving, I took a look at /var/log/maillog and found some suspecious lines. I checked with the Open Relay Checker at MxToolbox (http://mxtoolbox.com/diagnostic.aspx) and came back negative. Also, checked if my IP has been blacklisted, it's not. Here's a sample. Please let me know what you think. FYI, I slightly modified the urls, IPs, and time stamps. Code: May 29 12:00:00 myserver postfix/smtp: 8DFDXXXXD5: to=<[email protected][email protected][email protected][email protected][email protected] The urls are related and can be within a couple seconds of eachother. A couple hundred, similar to the sample, over the last few days.