feature request: [Mailing lists] Make it possible to add all e-mail addresses from individuals linked to specified organisations

[Wachizungu]

Is your feature request related to a problem? Please describe.

Yes. I have to combine e-mail addresses from active users on several MISP instances + some other sources, to send out certain communication. This is a rather painful experience. I'm looking for a place where I can maintain these types of lists easily.

In essence, thought is to have a way to automatically generate lists from data in Cerebrate (+ MISPs?), later on potentiall with some filtering options (tags perhaps).

Describe the solution you'd like

Extension of the current mailing list system, with an option to add all e-mails of users linked to certain organizations or org groups at once.

Additional context

Probably one of the use cases I'm most looking forward to is having an easy way to create the full mailing lists.