SMTP AUTH Modern authentication in managed devices

Question

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://learn.microsoft.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

Answer 1

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://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-onlinehttps://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online

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

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

Answer 2

Konica offers several methods of SMTP authentication, however "Basic" and "Modern" are not options.

Kerberos, NTLMv1, Digest-MD5, CRAM-MD5, "LOGIN", "PLAIN" are the only options available - do any of these correspond to "Basic" or "Modern"?

Ref: https://manuals.konicaminolta.eu/bizhub-4752-4052-UD/EN/contents/id08-_102672759.html