On 2020-04-21 23:21:14 +0100, Ian Collier wrote: > 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.
No, according to the RFC, it is the FQDN of the machine. > Perhaps the mistake is using the same setting for both the email address > and the Message-ID - but that's another question. That may be the default, but nothing prevents the user from configuring his software. :-) Every major MUA starts by asking the user to specify a mail account with some parameters, such as the e-mail address. Mutt would not be different, except that it does not force the user to configure it first. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
