We want to filter redirected mails into the groups based on the mail where it was redirected to. We often do this because people receive mails directly and forward them to Zammad. For this, the mail filter ‘resent-to’ is missing. I can also add the code to Zammad, I just wanted to discuss this first
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I think what you search is “X-Original-To”.
This mostly is the original to-address before forwarded.
I use this when you have only one incoming email-channel and forward automaticly
from other addresses to this one fetched from Zammad. Then you can auto-route these
tickets from their originally to-address to different groups. 
have fun, happy hacking
