Whitelist for message-acceptance (maybe also with DKIM?)
Currently it's possible to auto-accept or require confirmation for messages sent to the list depending on a person being member or a non-member.
It might imho be interesting to consider further "whitelists" for auto-acceptance or the like. Mabe mails coming in from a certain internal host (or a mail-webinterface with authentication etc.?) should be allowed in general? Or mails from a certain domain? Maybe whitelists for a domain should accept emails but only if DKIM-validation passes (to make sure the mail passed a legitimate server)?