Professionnel mails not threaded

[steve]

Hi,

When my colleagues reply to one of my emails, the are never linked to my
original email. Mutt just list them as if they were new, like this:

- email1 from me
- other emails
- reply to email1

I would expect to have

- email1 from me
   -> reply to my email1
- other emails

I suspect my company's emails don't respect RFC xy, but I would expect
mutt to detect when a email is a reply to an email and not a new email,
and thus thread it to the original email.

(Not sure I'm very clear, English is not my mother tongue)


So I'm wondering if I'm doing something wrong with mutt, or is it on my
company's side that there's something that could be improved.

Thank you.

steve