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.
Resolved:
Outlook don't use PLAIN authorization. I have added LOGIN to "mech_list" in /usr/lib/sasl2/smtpd.conf
/usr/lib/sasl2/smtpd.conf is below: ----------------------------------------------------------------------- pwcheck_method: saslauthd mech_list: plain login saslauthd_path: /var/run/saslauthd/mux -----------------------------------------------------------------------
And Outlook started to use SMTP/SASL, both - over TLS and without TLS.
Regards