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I have a straightforward setup here:

User A forwarder forwards to B and C.

When user C receives an e-mail and A has been CCed, two e-mails are delivered to user C. Up to 5 copies are being delivered to User C because of forwarders and CCs doing their combo dance.

I recently change web-hosts, On my previous host, the duplicates never arrived. I have no clue what changed in the new host's cPanel.

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migrated from webmasters.stackexchange.com Sep 7 '13 at 11:00

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Contact your web hosting provider. –  Michael Hampton Sep 7 '13 at 17:05
@MichaelHampton They don't have a clue (regarding SpamAssassin or otherwise) although I may have a solution which I've posted. –  Cold Fridge Sep 7 '13 at 17:48

1 Answer 1

I disabled SpamAssassin and that appears to have stemmed it. SpamAssassin was also acting up in numerous other ways, including flagging normal messages of our own domain itself for spam and encrusting almost each incoming message with a beautiful:

Spam detection software, running on the system "[server name removed]", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see root\@localhost for details.

Its detection level was set at the default 5 (similar to what it was at the previous host) with AutoDelete enabled yet it was processing messages in this annoying way and flagging very erroneously.

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