Ignore multimap whitelist from when email sent with several recipients

[stephdl (Stéphane de Labrusse)]

@davidep

The “block to” feature was never asked before, I think because the whole mail-filter component is not designed to enforce restrictive policies against internal users.

only @jfernandez asked for it IIRC : Migrating from MDaemon to nethserver-mail

Maybe he can help in this topic