Quoting Sébastien CARRE (sebast.carre@???):
> In order to test it, I want to be able to hold some emails in the queue
> (from a specific adresse for example). Is this possible ?
You could set 'hold_domains = domain.tld : domain2.tld' in your
exim4.conf. You might have to restart Exim4 for this to become active.
Held mail can be forced to deliver with exim4 -M <msgid>.