Mailing list for societies contact persons

One-sentence description

Create an automatic mailinglist for all contactpersons of the societies.

Motivation

When the contact person of a society changes it is a lot of double work for the new intern to also update the mailing list. (Request from @tvalten)

Desired functionality

Create a new automatic mailinglist for all heads of the societies. These people are the contact persons.

Suggested implementation

Look at how the commitee chair mailinglist is done.

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