On Thu, Jan 29, 2026 at 04:55:22PM +0100, Vincent Lefevre wrote:

I did a test with a message in a maildir mailbox that just contained
the headers

 Return-Path: <>
 To: [email protected]

(since it is in a maildir mailbox, there is no "From " line).
Note that the Return-Path is valid (used by mailer-daemons).
When I copied the message to a (new) mbox file, I obtained the
following "From " line:

 From @ Thu Jan 29 16:16:11 2026

Yeah, that's not good.

In that case, or whenever Mutt has nothing to put there, it could generate a dummy address -- maybe [email protected], or invalid@invalid.

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