SMTP AUTH Modern authentication in managed devices

Marek Tomčo 25 Reputation points
2023-01-25T14:12:38.1566667+00:00

Hello,

Our application is distributed by admin to numerous devices, which are then expected to function based on input policy/configuration. With deprecation of Basic login in SMTP Im having hard time finding correct new way of setting up local email notifications.

OAuth2 cant be configured by admin separately for each device, and auth token received on admin machine shouldnt be shared by many devices.

None of these recommendations apply https://video2.skills-academy.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

Our application uses custom C++ solution for emails. We cant rely on any Microsoft solution installed there, as we support multiple different email providers. Currently we use SMTP AUTH with LOGIN, DIGEST-MD5 and CRAM-MD5, all of these I presume are "Basic authentication"

What is the proper way of using SMTP protocol to work in future?

Thank you

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Accepted answer
  1. Andy David - MVP 144.2K Reputation points MVP
    2023-01-25T15:54:39.04+00:00

    Hi, Basic auth for SMTP will continue to work. The recommendation of course is to upgrade to Modern Auth, but as long as SMTP auth is enabled in the Exchange Online Tenant, then basic SMTP auth will work for now:

    [https://video2.skills-academy.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-onlinehttps://video2.skills-academy.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online

    User's image

    Note also, if you need to continue to use legacy TLS as well for these devices:

    [https://video2.skills-academy.com/en-us/exchange/clients-and-mobile-in-exchange-online/opt-in-exchange-online-endpoint-for-legacy-tls-using-smtp-authhttps://video2.skills-academy.com/en-us/exchange/clients-and-mobile-in-exchange-online/opt-in-exchange-online-endpoint-for-legacy-tls-using-smtp-auth

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    3 people found this answer helpful.

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