[MlMt] Omit from All Messages

[Marc ARC]

Hello,

What is the best way ( less MM resources intensive ) to omit:
- a Source
- a specific mailbox
from the standard All_Messages mailbox.

ex: I don’t won’t MM to look for mails in
- an Archived_Blacklisted_mail_mailbox
- archive mailboxes which are 10 years old

Thanks,

Marc