qmail adds number to recipient header

qmail sometimes adds a number to the recipient header when delivering mail locally, so for example, user@domain.com may become 3-user@domain.com.  This isn’t such a problem when mail is just being used locally, but if your using a POP connector to download mail to an Exchange server for example it will cause issues with it getting to the right mailbox.

This is actually by design and is there to prevent mail loops when using catch all addresses.  The only real workarounds are to stop using catch-all and use a mailbox for each address.  It’s actually only the “Delivered-To” header that gets modified/added, not the “To” header, so it might be possible to get Exchange or you POP collector to look specifically at the right header.

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