Office 365 shared mailboxes with Microsoft 365 Channel (APP/OAuth)

Yes, Zammad would need to make available and use an optional separate “mail account field”.

For shared mailboxes the needed method is:

S = Shared Mailbox name, e.g. shared@example.tld
U = User who has full access to shared mailbox S, e.g. , e.g. bob@example.tld

  1. Get Access Token for User U.
  2. Open an IMAP connection using Username S, but access token obtained for User U in step 1

Taken from Access shared/delegate mailbox of Office 365 | Blog | Limilabs

Currently, Zammad uses user name U in step 1 and 2 with no way to change it in step 2.

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