John W. Baxter wrote:
Probably, indeed. But what happens if that header was already "taken" in the process that brought the message to mailman for distribution to the list?
As I noted in my previous response, I believe that the correct field (if Mailman were to add a "Sender:" header) to add would be "Resent-Sender". Please see RFC 2822, section 3.6.6. The "Resent-Sender" field may be multivalued, so this isn't a problem. However, Mailman should not be modifying the Sender: field at all.
"Original-Sender" is a header used when gatewaying X.400 messages into RFC 822 messages for use in JNT mail networks. It would not be appropriate for use here.
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