I created a Client, then a Site (testsite.com), then a couple of users under that Site. I tried logging in to https://myispconfig:81/mailuser. Failed with firstname.lastname@example.org (postfix virtusertable), but succeeded with web3_myuser (system account). Why's that? A quick check shows that ISPConfig reads the isp_isp_user table, probably completely ignoring the postfix virtusertable it wrote during user creation. Also, IMAP doesn't work (from SquirrelMail). How does Courier-IMAP tie to Postfix's authentication?