I'm sure folks have seen this (many times) already, so thanks for the help up front. So I'm trying to get mailman to run on FC3, and I am running into the following problem: >> ----- Transcript of session follows ----- >> Group mismatch error. Mailman expected the mail wrapper script to be >> executed as one of the following groups: >> [mail, postfix, mailman, nobody], >> but the system's mail server executed the mail script as group: "mailnull". >> Try tweaking the mail server to run the script as one of these groups: >> [mail, postfix, mailman, nobody], >> or re-run configure providing the command line option: >> '--with-mail-gid=mailnull'. >> 554 5.3.0 unknown mailer error 2 Since I installed mailman from the RPM, I didn't configure it. Further, sendmail.8.13.1 has a config option that looks like # default UID (can be username or userid:groupid) # O DefaultUser=mailnull If you set DefaultUser to something else, everything else goes south... Anyone have a suggestion? Thanks, and have a safe and happy new year, Dave