How to not disable the showing of hostname in message-id?

[Mike Coddington]

On Sat, Mar 16, 2019 at 11:45:51AM -0500, Peng Yu wrote:
> Hi,
> 
> I set `hidden-host` to yes. But the hostname still shows up.
> 
> http://www.mutt.org/doc/manual/#hidden-host
> 
> I don't want to use the following solution as it still shows the
> hostname even it is fake.
> 
> https://bbs.archlinux.org/viewtopic.php?id=213306
> 
> Could anybody let me know if there is a way to disable the appearance
> of hostname in message-id? Thanks.

RFC 5322 says that a message ID must be globally unique. It's suggested
to use your hostname as it is almost guaranteed to be unique. You're
going to have to have something after the @ sign, so if you don't want
to use your hostname, you're going to have to have something "fake."
Here's a link to RFC 5322 so you can see what the requirements are for
message IDs. You're really making it difficult on yourself to change
this; consider how important it actually is.

https://tools.ietf.org/html/rfc5322#section-3.6.4

Good luck! If it were me doing this, I'd do what they recommend on that
Arch Linux forum post. That seems simple enough and keeps things
compliant.

-- 
Put your Nose to the Grindstone!
                -- Amalgamated Plastic Surgeons and Toolmakers, Ltd.