> On Apr 8, 2020, at 12:12 PM, Viktor Dukhovni <postfix-us...@dukhovni.org> > wrote: > > The SASL mechanisms supported by [smtp.office365.com]:587 are: > > posttls-finger: < 250-BL0PR02CA0022.outlook.office365.com Hello [...] > posttls-finger: < 250-SIZE 157286400 > posttls-finger: < 250-PIPELINING > posttls-finger: < 250-DSN > posttls-finger: < 250-ENHANCEDSTATUSCODES > posttls-finger: < 250-AUTH LOGIN XOAUTH2 > posttls-finger: < 250-8BITMIME > posttls-finger: < 250-BINARYMIME > posttls-finger: < 250-CHUNKING > posttls-finger: < 250 SMTPUTF8 > posttls-finger: > QUIT > > "LOGIN" and "XOAUTH2". Terminology corrections aide, disabling the > latter via: > >> Adding >> smtp_sasl_mechanism_filter = plain, login >> made things work again > > is most likely the correct solution, with "login" the one that'll be > used in the case of "[smtp.outlook.com]:587".
That said, we might unfortunately have to figure out how to deal with XOAUTH2 at some point: https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-april-2020-update/ba-p/1275508 -- Viktor.
