Is there some method other than a pinned announcement to let folks know verification is needed to post in my sub?

One of the subs I run requires verification to post. There is a pinned announcement at the top of the sub to let people know.

However, I still get 3-5 modmail messages per day from folks who want to post, and who seem to have completely missed the pinned announcement.

Is there some other mechanism I can use to inform people that verification is required to post in the sub?

I moderate primarily via the most current desktop interface.