May 11, 2022

SMTP / Office 365 / OAuth2 : SmtpCmdResp: 535 5.7.3 Authentication unsuccessful

Question: A customer wants to send emails with Office 365 and OAuth2 Authentication. The setup of the application in Azure is OK. It works for one user. For another user we have the following error: SmtpCmdResp: 535 5.7.3 Authentication unsuccessful [****.****.prod.outlook.com] For authentication I use the example: https://www.example-code.com/powerbuilder/office365_oauth2_access_token.asp What is surprising is that for the second user on same PC, […]

OAuth2 0 1 min read
June 9, 2020

Office365 SMTP Error: 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied;

Question: I’m trying to send email using SMTP via smtp.office365.com, and I get this error: 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message. 0.35250:0A001485, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:59020000, 1.36674:0E000000, 1.61250:00000000, 1.45378:5E020000, 1.44866:F8000000, 16.55847:BC030000, 17.43559:0000000024020000000000000000000000000000, 20.52176:140FFA8B1500001000000000, 20.50032:140FFA8B8517001000000000, 0.35180:F1030000, 255.23226:09000000, 255.27962:0A000000, 255.27962:0E000000, 255.31418:F1030000, 0.35250:0300C981, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:3A000000, 1.36674:32000000, 1.61250:00000000, 1.45378:3F000000, 1.44866:01000000, 16.55847:A6000000, […]

Office365 0 1 min read
May 26, 2020

Authentication Problem with Sending Email in Office365 using SMTP

If SMTP authentication (using login/password) fails for your smtp.office365.com account, then it may be that your account is configured to require MFA (multi-factor authentication).   You may need to change settings to allow for legacy authentication (single-factor auth).   See https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/block-legacy-authentication Also, an app password may be required.  See https://docs.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-app-passwords    

Office365 0 20 sec read

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