org-msg VS oauth2ms

There is also org-msg as another option (haven't tried both so can't compare).

org-msg replaces a lot of message composition behavior, so it's not a big surprise that it doesn't respect that variable. Make sure you're referencing org-msg's README while customizing it.

Funny, just dealt with the whole O365 authentication just this week. With moving to 2 factor authentication you need to use OAuth 2 to do anything with it. I have my (work) O365 email forwarded, so I do have normal IMAP access. I use isync/mbsync [1] to receive email, goimapnotify [2] to get pushed new email, read/reply/etc with mu4e [3] and org-msg [4] and org-mode, and until recently just plain SMTP to send mail. This last part will break with 2 factor, but found oauth2ms [5] to set up the OAuth to work with O365 SMTP. The trick was to find the "tenet ID" from the Azure page of your organization and to use Thunderbird's credentials [6] (or another mail program, since I can't make new app registrations on Azure to have my own "application"). That should also allow you to use IMAP with OAuth 2 as well, but haven't done that since I still have the forwarding. (As usual, I think the Arch Wiki [7] covers most of this too.)

[1] http://isync.sourceforge.net/

[2] https://gitlab.com/shackra/goimapnotify

[3] https://www.djcbsoftware.nl/code/mu/mu4e.html

[4] https://github.com/jeremy-compostella/org-msg

[5] https://github.com/harishkrupo/oauth2ms

[6] https://hg.mozilla.org/comm-central/file/tip/mailnews/base/s...

[7] https://wiki.archlinux.org/title/Isync#Using_XOAUTH2

I'm using org-msg like this (great package btw, doesn't get enough attention if you ask me):

https://github.com/jeremy-compostella/org-msg/issues/1#issuecomment-426415584 is one of the things which pushed me towards org-msg.

Funny, just dealt with the whole O365 authentication just this week. With moving to 2 factor authentication you need to use OAuth 2 to do anything with it. I have my (work) O365 email forwarded, so I do have normal IMAP access. I use isync/mbsync [1] to receive email, goimapnotify [2] to get pushed new email, read/reply/etc with mu4e [3] and org-msg [4] and org-mode, and until recently just plain SMTP to send mail. This last part will break with 2 factor, but found oauth2ms [5] to set up the OAuth to work with O365 SMTP. The trick was to find the "tenet ID" from the Azure page of your organization and to use Thunderbird's credentials [6] (or another mail program, since I can't make new app registrations on Azure to have my own "application"). That should also allow you to use IMAP with OAuth 2 as well, but haven't done that since I still have the forwarding. (As usual, I think the Arch Wiki [7] covers most of this too.)

[1] http://isync.sourceforge.net/

[2] https://gitlab.com/shackra/goimapnotify

[3] https://www.djcbsoftware.nl/code/mu/mu4e.html

[4] https://github.com/jeremy-compostella/org-msg

[5] https://github.com/harishkrupo/oauth2ms

[6] https://hg.mozilla.org/comm-central/file/tip/mailnews/base/s...

[7] https://wiki.archlinux.org/title/Isync#Using_XOAUTH2

I’ve been using this successfully for the last year: https://github.com/harishkrupo/oauth2ms

@harishkrupo has posted over on r/emacs and helpfully described in even more detail on github the steps to follow to get mbsync working with office365 and has written a python script that handles getting the token from the identity server and putting it into a format that mbsync can use. Crucially, he explains how to set up the azure app that the token is generated for. Really, this guide made a lot of things clear that I had been absolutely muddling through previously.

This works well: https://github.com/harishkrupo/oauth2ms Does require setting up an App in your Microsoft tenant (don’t know if it works across tenants)