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How can I enable non-delivery reports (NDRs) to external mail senders?

The automatic non-delivery reports (NDRs) in reply to emails sent to non-existing addresses in your organisation are a feature of Exchange and POPcon does not interfere with them. You can enable or disable NDRs using your Exchange System Manager:

  1. Open the Exchange System Manager at Global Settings > Intenet Message Formats and right-click on "Standard" coming up on the right-hand pane, then chose "Properties".

  2. Check or uncheck "Allow non-delivery reports".