I faced a vexing problem with the otherwise excellent Mozilla Thunderbird email client. I was unable to forward emails to another account using the rules in Message Filters. I can normally forward emails. I can also execute other actions in the message filters except forwarding. It fails with a simple error message: "Sending of message failed". The simple solution lies in understanding the design of email accounts & message filters in Thunderbird, as described below in details.
BTW: At one point before solving this problem I even thought about switching to Evolution. And I am not alone. Several people posted the same problem on Mozilla forum without getting any solution.
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