Hello, I'm running postfix on FC14. Followed Falko's brilliant-as-always guide to do this. I setup 3 virtual users. I'll call them [email protected][email protected][email protected] I am using my cellphone to connect to the accounts. My phone managed to connect to both incoming (IMAP) and outgoing (SMTP, duh!) servers with [email protected] However, for b and c, it only authenticated the incoming, but responds saying User Authentication failed for outgoing. If I put a's credentials for outgoing, it works. This is also true in Thunderbird. I have to use a's credentials to login to SMTP. Maillog shows the following: Using b Code: Mar 22 23:44:21 server postfix/smtpd: warning: unknown[192.168.1.1]: SASL LOGIN authentication failed: authentication failure Using a Code: Mar 22 23:48:56 server postfix/qmgr: 2F8522C1F6F: from=<[email protected][email protected][email protected][email protected][email protected] Since a's credentials work, it would only follow that b and c should work, too; I can't see where there would be a config issue... what could be the problem?