Aw: Re: Duplicate Posts with Forum and Mailing List Synchronization
Here's a quick'n'dirty hack to make it work (still need a decent Fix in Tiki itself).
In lib/notifications/notificationemaillib.php insert the following around line 56:
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$mail->setHeader("X-Tiki", 'yes');
And then in the POP3-mailbox create a Sieve rule like the following:
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if header :contains "X-Tiki" "yes" { discard; }