Yes you can. But you can't do it thought the web ui yet.
https://gitlab.com/mailman/mailman/issues/426#note_43861203 has pointers to what needs to be done
On 07/01/2018 12:19 PM, robert.kydd@gmail.com wrote:
Hi My users are upset that when their mail is waiting moderation release they receive this message:
'Your mail to 'Members' with the subject
AW: [Members] Hamburg 2019Is being held until the list moderator can review it for approval.
The reason it is being held:
Post by non-member to a members-only list'Is their a way to change the text "post by a non-member to a members-only list" as they are registered members of the Joomla site
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