I don't use courier on this server. I am actually not going to have any mail accounts for POP3/IMAP. Just letting some devices send incoming mails (who are processed by php) and then in some occassions let the server send outgoing mails.
And the incoming and outgoing mail function with virtual users in mysql etc. works ok. I would very much now like to have the smtpd authenticate with at least LOGIN/PLAIN, and this is the problem.
So, I can't turn on courier debug.
Do I need courier to make smtpd authenticate?