Thanks for the clarification on the list type.
If the list is only 30 people, perhaps it should be setup as an "alias." Aliases can send to multiple people, but do not have the same controls in place, IE; being able to disallow responses, or have the responses sent to the original sender, vs the alias.
If the group is setup as an alias, then anyone can respond.
Aliases can easily get out of control because when someone responds, their response will go to everyone.
One of the beauties of lists is in the fact that they can be configured for one-way communication only.
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