SMTP Sending via office365.com

  • Resolved Dieter_H

    (@dieter_h)


    3 years, 10 months ago

    Hello support,
    First: WP-Mailster now running very fine for over 1 year – thanks for that fantastic tool.
    This week we changed our mailprovider to Microsoft365 – now there are lots of problems.
    Sending doesn’t work any more – here the SMTP-server configuration:
    smtp.office365.com port:587 prot:smtp secur: TLS use auth: yes
    connection test during sender-configuration is positive but
    sending stops after 3 errors with detail error “STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message”

    Thank you for help
    Dieter

    The page I need help with: [log in to see the link]

Viewing 2 replies - 1 through 2 (of 2 total)
  • Plugin Author brandtoss

    (@brandtoss)

    Hi Dieter,

    since I do not have Office365 experience myself I ended up googling the problem.

    As it looks like, Office365 is not a great choice for mailing lists. Why? Because they do not seem to allow emails being sent where the FROM email address is being altered.

    Here is where I got this info from:
    https://stackoverflow.com/questions/54784431/unable-to-send-smtp-mails-using-office365-settings

    Altering the FROM address is of course the normal setup for mailing lists (where FROM is changed from the mailing list email address to the original sender).

    So either
    – you change your mailing list settings to only use the mailing list email address as the FROM
    – use a different email provider

    Thanks.

    Thread Starter Dieter_H

    (@dieter_h)

    Hi brandtoss,
    oh, that’s not the answer I wanted to read – but thanks for your googling.
    So I have to switch back to the old mailprovider and forget about teams and other stuff from microsoft connected to this domain.
    Thanks for quick answer

Viewing 2 replies - 1 through 2 (of 2 total)
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