I must be stupid I guess, but I've installed Ubuntu 6.06 via the The Perfect Setup - Ubuntu 6.06 LTS Server (Dapper Drake) HowTo. Got ISPConfig up and running and receiving mail but having issues sending via Outlook Express, Outlook or Thunderbird. Postfix with SMTP-AUTH and TLS, I believe I'm not setting this up correctly in the client. POP3 Mailserver: mail.mydomain.com Username: web1_myuser SMTP Server: mail.mydomain.com Username: web1_myuser What am I missing? When I try to send it keeps coming up with password box, I've selected TLS, if available.