uucp-uudom

More modern implementations of UUCP can understand and correctly handle domain-style addresses in headers (although they still require the ! form in the envelope). If yours is such an implementation, you can use the uucp-uudom delivery agent.

At the receiving end, the message mail arrives with the five-character "From" line showing the sender address in the ! form. The "From" line reflects the envelope address.

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