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I have started to receive a number of complaints of bounces reporting:
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<<< System error - unable to forward message.
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What could possibly cause this error? So far the bounce has only been reported when delivering to a mailbox with a .courier file listing two email addresses, one being a locally hosted address and the other on a remote host.
submit is rejecting the forwarded message. If you have some antivirus filter hooked into submit, the dumb filter is probably rejecting the forward, even though it didn't complain about a nearly identical message that was received only a few seconds ago.
Either that, or one of the forwarded addresses is invalid.
The current version of Courier now logs the additional error messages, which would've clarified the situation.
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