How to Set Your Send-To Permissions on Exchange and Office365

To solve send-to permissions issues for both Mac and Windows users, you can set send-to permissions on Exchange.

Users can still select the list in Outlook, but when they send, Exchange rejects it and bounces it back.

PoliteMail bypasses that check, so authorized PoliteMail users can send to those lists. This also prevents unauthorized users from sending to all-employees and other large distribution groups.

How to block send-to list permissions in Office365

To achieve your 50% of users can and 50% can’t send to all, customers have had success with the following workaround:

  1. Deploy our Syncronym tool to sync (certain) distribution groups with PoliteMail (e.g. the all-employees or any other protected list).
  2. On the Exchange/AD side, hide these lists (set as hidden so users can not even access them from Outlook). For Exchange on-prem this can be done via PowerShell:
    Set-UnifiedGroup -Id Group -HiddenFromAddressListsEnabled $True and synchronized via Entra ID with 0365.  Click here to read a Microsoft forum discussing this issue
  3. Set-up user groups within PoliteMail (e.g. All-Enabled), and add authorized users to the All-Enabled group.
  4. Set list permissions for the synchronized protected list(s), to allow users from All-Enabled to View/Send.

In terms of add-in compatibility, we recommend testing. If you are still having difficulties, PoliteMail’s development team should be able to make them compatible if there is a conflict.

Setting these permissions will also prevent a dreaded Reply-All apocalypse.