Hi There, I installed Mailman from the Plesk 8.0.1 control panel and was able to access the web GUI for mailman. I created the list firstname.lastname@example.org which seemed to go OK. I added one email address to the testing list and logged out of the GUI. I sent an email to email@example.com and received an error message: <firstname.lastname@example.org>: 22.214.171.124 does not like recipient. Remote host said: 550 sorry, no mailbox here by that name. (#5.7.17) Giving up on 126.96.36.199. I looked at the Plesk Control panel and found there was no email group created named "testing" under raystedman.org. This seems to be consistent with no mailbox found. Other email operations are working fine on this box. There seems to be a connection between Mailman and Qmail that needs to be completed. This installation of mailman was performed when most of the production DNS records for this domain were pointing to another server. This may have been the root cause of the problem. The DNS is now all pointing to this box. Thanks in advance for your help! Greg PS. Perhaps removing Mailman so that Plesk believes it is not installed and re-installing mailman from Plesk is the answer. I will give this a try if someone can help me accomplish the uninstall of mailman.