If they have full access to the mailbox, you cant prevent deletions.
Otherwise, delegate individual folders and give reviewer access only.
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This question was already raised here: https://learn.microsoft.com/en-us/answers/questions/1536107/how-to-restrict-shared-mailbox-user-from-deleting
But the suggestion to use Microsoft 365 Groups instead is not applicable for my team where we want to send and receive emails on behalf of a specific email address which is why a shared mailbox is more suited for our needs.
Aren't there any workarounds available wether it be on the desktop app or web app?
If they have full access to the mailbox, you cant prevent deletions.
Otherwise, delegate individual folders and give reviewer access only.