Jay Lee writes:
Any thoughts here Sam? Wanted to check with you before I file a bugzilla with Thunderbird. I do know that at least one other SMTP Server (Mercury/32 4.52) returns the bad address in the 550 message.
You can make an argument go either way. However, the 550 User unknown is a response to a single, specific, RCPT TO: SMTP command. The sender knows exactly which address failed.
Observe that when Courier attempts to deliver a message, and a recipient is rejected, the resulting bounce not only quotes the rejection message, but also includes whatever command caused the error.
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