Hi all,

I’m writing to see if anyone has advice for how to troubleshoot Mailmate’s 
compatibility with Office365.

Up until a few months ago, Mailmate worked just fine for me (great, even!) with 
my work’s Exchange-based email server. Mailmate would pull up my university’s 
credentialing website, and it would retrieve what I assume is an OAuth 
credential (but I don’t fully understand the terminology here).

Recently, however, it stopped working, and I haven’t been able to get it up and 
running again. I spoke with our IT department, and they explained that they had 
recently moved from an “on premises” version of Office365 to a cloud-based 
version, and that they made other changes in response to attacks on the 
university’s email accounts. The upshot, they said, is that OAuth is no longer 
enough for mail clients to connect to our mail servers, and that mail clients 
need to support multi-factor authentication “directly in the client.”

I confess that I don’t really understand what it means for an email client to 
support MFA “directly in the client.”

I do know that when I use the Apple Mail client, it works fine by 
authenticating me in the same way that Mailmate does (by opening up a browser 
window to have me log in to a university site). Beyond that, though, Apple Mail 
doesn’t seem to be doing anything different, and there’s nothing that is 
obviously “directly in the client.”

Any thoughts or suggestions would be greatly appreciated!

Best,
Alex
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