postfix relayhost to office365?

[Tom Horsley]

I had postfix setup to relay all the mail from my
desktop to the stoopid office365 server we are forced
to use at work. It worked fine on fedora 27.

Now, with everything configured identically
on fedora 28, postfix can't seem to send out any mail.

I don't suppose anyone else has this combo working?

I get errors like this when I enable extra debug
output for talking to the office365 smtp server:

May  6 14:29:05 tomh postfix/smtp[406521]: starting new SASL client
May  6 14:29:05 tomh postfix/smtp[406521]: name_mask: noanonymous
May  6 14:29:05 tomh postfix/smtp[406521]: smtp_sasl_authenticate: smtp.office365.com[40.97.24.18]:587: SASL mechanisms LOGIN XOAUTH2
May  6 14:29:05 tomh postfix/smtp[406521]: xsasl_cyrus_client_get_user: [e-mail]
May  6 14:29:05 tomh postfix/qmgr[406467]: warning: private/smtp socket: malformed response

Strike a familiar note with anyone?

[Tom Horsley]

On Sun, 6 May 2018 15:05:55 -0400
Tom Horsley wrote:
> SASL mechanisms LOGIN XOAUTH2

Hey! I just found the problem. The XOAUTH2 is what doesn't work.

I finally discovered the smtp_sasl_mechanism_filter parameter
and set it to just login, and the mail is flowing again.

Since oauth2 was invented by google for google, and
microsoft loves to screw up "standards", I'd guess the
problem is with microsoft's implementation of oauth2
(but that's just my natural tendency to assume microsoft
is the problem when it is involved with anything).