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did it work at one point? off the top of my head i could see this happening because the forwarding might happen at the mta level before it even reaches the lmtp level for filtering and autoreplying.
We have a few inactive accounts because they are migrating to new email accounts on another domain name. So we need to have auto-reply to inform senders about their new email addresses while not having to keep the senders emails as to aviod filling up the inboxes since no one will access and clear the inboxes.
Hope this will get fixed asap. My customers are very unhappy over this essential service that is not working for their requirements.
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Auto-reply not working when don't keep a local copy is activated 
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