Is it not posseble to do this? Login with username@domain? Yes i know that ISPconfig uses system accounts and not sql based for example. But how about make courier read from virtusertable and match it to the system account? Is it not posseble to doit with authdaemon? authdaemon does all the accounts checkup, right? So i was woundering if sombody have lookt in to this and saw that it was imposseble. I see authcustom in authmodule.. Thanks ISPconfig devteam for all the work! great package!