On 21 Mar 2017, at 22:50, Alexandre Takacs wrote:

I am having some issues connecting via MM/IMAP to a freshly deployed Exchange 2016 server (first time I am trying this).

Basically I can't seem to be able to authenticate

        21:46:53 C: A1 AUTHENTICATE PLAIN ••••••••••
        21:46:53 S: A1 NO AUTHENTICATE failed.
21:46:53 Error: Server response: “A1 NO AUTHENTICATE failed.”. Command attempted: “A1 AUTHENTICATE PLAIN ••••••••••”.

Am I missing something here ? My credentials are correct as they work with OWA.

In the past I've seen an Exchange issue which I created a workaround for. You can try this:

defaults write com.freron.MailMate MmExchangeAuthPlainWorkaround -bool YES

Let me know whether or not that works for you.

--
Benny
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