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In versions 14.5 and greater when I try to send a message to a disable mailing list get this exception in delivery log:
15:11:45  Starting local delivery to email@example.com
15:11:45  Processing Mailing List: firstname.lastname@example.org
15:11:45  Delivery for email@example.com to firstname.lastname@example.org has completed (Delivered)
15:11:45  Exception: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
15:11:45  Delivery finished for email@example.com at 3:11:45 PM [id:794037415686]