Description of problem: I copied everything I was doing in fedora 27 to fedora 28, including my postfix relayhost setup to send everything to smtp.office365.com. In fedora 27 this all worked. In fedora 28, the mail queued up with errors when attempting to authenticate on the relay. With extra debug turned on, the errors looked like: 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: Tom.Horsley May 6 14:29:05 tomh postfix/qmgr[406467]: warning: private/smtp socket: malformed response After much poking around, I found the postfix setting: smtp_sasl_mechanism_filter = login That forced postfix to use LOGIN, not XOAUTH2, and all the mail sending started working again. Version-Release number of selected component (if applicable): cyrus-sasl-2.1.27-0.1rc7.fc28.x86_64 postfix-3.2.5-4.fc28.x86_64 How reproducible: 100% (at least with office365) Steps to Reproduce: 1.configure relayhost to smtp.office365.com 2.watch postqueue -p as the queue fills up 3. Actual results: failure to send mail Expected results: sending mail Additional info: Since oauth2 was invented by google, I have a major tendency to suspect microsoft's implementation isn't compatible with whatever standard might exist, but I know nothing for sure.
Thank you for filling a bug report and testing with a new version. There were many changes in the recent cyrus-sasl update (not sure if something changed in postfix -- it would be great if you could reproduce the same issue with the old postfix to isolate the issue to cyrus-sasl), but I don't know details about XOAUTH2 mechanism in sasl so filling also upstream issue might get you some more feedback, ideas if this can be fixed somehow from more knowledgeable developers: https://github.com/cyrusimap/cyrus-sasl/
I submitted this new issue pointing to this bugzilla: https://github.com/cyrusimap/cyrus-sasl/issues/511 (so now they point to each other).
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Fedora 28 changed to end-of-life (EOL) status on 2019-05-28. Fedora 28 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.