I have mail server on CentOS 4.1. Sasl authorization for SMTP is enabled. Thunderbird sends mail, but Outlook get an error 554, Relay access denied, error number 0x800CCC79
Outlook has a login and password for SMTP enabled.
It is strange, because there is no any sign of authorize in maillog when Outlook try to send mail.
It looks like Outlook don't sent login and password for SMTP.