When using Microsoft oauth2 for bounce/unsubscribe handling and an office 365 account; it is possible to use a single login but to access a shared mailbox by simply filling in the
This allows a cost saving by using a single licensed account ($/m) to access an arbitrary number of unlicensed shared mail boxes instead of needing a license for every login.
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username field. This allows a cost saving by using a single licensed account ($/m) to access an arbitrary number of unlicensed shared mail boxes instead of needing a license for every login.
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