[sieve] Restrict redirects to only own domain

[Yassine Chaouche]

Hello list,

I'd like to let my colleagues redirect mail automatically (via a sieve 
filter) to other mailboxes within the same domain, but deny redirects to 
outside mailboxes (gmail, yahoo etc.) since this is considered bad 
practice and could lead to blacklisting (forwarding spam for example).

If I set sieve_max_redirect to 0 then no redirect is allowed, at all. I 
wish to let redirects to internal mailboxes still possible.

Ideas ?

Yassine.