Set Thunderbird "from" address by incoming "to" address

I have configured my email server to send all email to my mailbox. So [email protected] and [email protected] go to one mailbox.

Every forum, registration, and guy get their own address for sending me emails so I can deliver their messages to /dev/null if anyone starts spamming. That’s the working setup.

Now the problem: If I reply to a message, then Thunderbird always sets my default Identity as the sender. I know I can add additional identities, but I don't want to add every address.

How can I configure Thunderbird so that when an email is sent to [email protected], replies will come from [email protected]?

Not an automatic solution but the Virtual Identity addon for Thunderbird might help. It allows you to edit the From: field (assuming your smtp server allows it).