On Tue, Apr 21, 2020 at 11:16:03PM +0200, Vincent Lefevre wrote: > This is a user-side problem. Users should make sure that their > hostname setting is unique (possibly with a very high probability, > assuming no attacks). See below.
No. The hostname is what goes after the @ in your default email address. It better be a deliverable address. Perhaps the mistake is using the same setting for both the email address and the Message-ID - but that's another question. imc
