Office 365 App Password Not Working Smtp. Option 1 requires authentication to work and i have since been able to confirm from microsoft that option 1 will not work when mfa is enabled. I saw another post here from back in july a year ago, but there was no resolution.
I have noticed a number of queries on the support forums about connecting postsmtp with office 365 email accounts. I hope this helps you too! I think the authentication needs to be ssl but that is not a selection and none of the other settings will work.
However upon clicking done, there will be a message saying unable to log in at server.
The smtp server requires a secure connection or the client was not authenticated. Visit your security basics page online to get an app password. Some people are able to use that app password, and can get into outlook 2016 without issue. If prompted, type a name for your app password, and click next;