I've never run a mailserver before, but I went through the Perfect Server tut without any installation issues. Website is up and running and postfix is able to send messages to outside addresses (i.e., my personal gmail account) but messages sent to firstname.lastname@example.org get rejected: This doesn't seem to have affected the logs at all (the test email was sent at 19:07:50): mail.log: (I've noticed that I misspelled "locldomain" in /etc/hosts, but fixing that has had no effect on the problem.) here's /etc/postfix/main.cf: In addition, squirrelmail fails every login attempt, saying "Unknown user or password incorrect." Here's a relevant portion of mail.log: I have my router forwarding port 25 to the server and my ip address is static. I've added nothing to the server beyond what the tut went over (save for the website in /var/www but that shouldn't matter). I've searched the web and have found various other people having problems logging in to squirrelmail, but there are so many different permutations and none of them match the issue I'm having, which makes me hesitant to attempt their workarounds for fear of screwing things up more. Any suggestions?