"New" Outlook and accounts on SmarterMail

Problem reported by Sébastien Riccio - 9/20/2025 at 2:21 PM

Submitted

Hello,

I would like to ask if any of you were able to add an account hosted on SmarterMail on the new Outlook client ?

For my part I tried it in a VM with a fresh win 11 install with Outlook installed part of o365, to add a mailbox but without success. I tried with a MAPI/EWS enabled account, IMAP account... no luck so far.

Same account can be added with the classic outlook or other mail clients (emClient, Thunderbird).

Also it's a pain to troubleshoot as the connections from the New Outlook to our SM server are proxied through their "*ç% cloud, so not really practical when using IP address to search the logs...

Any one had some experience with this ?

Kind regards.

Sébastien Riccio

System & Network Admin

https://swisscenter.com

6 Replies

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Gabriele Maoret - SERSIS Replied

9/21/2025 at 2:24 AM

The "new Outlook" is a shit... 😅

Gabriele Maoret - Head of SysAdmins and CISO at SERSIS Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

Sébastien Riccio Replied

9/21/2025 at 9:48 AM

For sure it is :) Still I am wondering if someone was successfully able to use it with SM.

It is now getting pushed quite hard by MS. AFAIK in fresh installs of Win 11 it's kinda pre-installed.

Sébastien Riccio System & Network Admin https://swisscenter.com

Douglas Foster Replied

9/21/2025 at 1:14 PM

I would start by tweaking autodiscover. Some options are probably incompatible with MS need to eavesdrop on the connection

https://portal.smartertools.com/community/a93872/streamlining-autodiscover.aspx

Oliver Replied

9/21/2025 at 2:01 PM

Outlook New cannot use MAPI or EWS, and probably never will be able to.

IMAP in Outlook New only works flawlessly with Outlook.com and Microsoft365.

Only POP3 will work.

Sébastien Riccio Replied

9/21/2025 at 9:12 PM

Hello Douglas,

I'm afraid there isn't much we can tweak on autodiscover. We already did our best about it and it perfectly works with Outlook Classic, Outlook on mobile, emClient, thunderbird (yeah they added autodiscover support and it surprisingly works quite well to replace autoconfig).

Still I'm going to try to inspect with fiddler, what the New Outlook is sending/receiving during the autodiscover phase, but it does it with MS's cloud, not the server directly...

Kind regards

Sébastien Riccio System & Network Admin https://swisscenter.com

Sébastien Riccio Replied

9/21/2025 at 9:15 PM

Oliver,

So basically we're screwed to provide support for our c ustomers wishing/being forced to use this piece of ...

We tell our customers that MS only care that they client works with their own mail service, but then they says: I was able to add my google account in it without problems...

Pfff :)

Sébastien Riccio System & Network Admin https://swisscenter.com

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