Since a couple of hours I am receiving continuous subscription requests from addresses such as sqoon+random_characters@domain and sqoonart+random_characters@domain

I have added to the ban list the following regex to stop them from even subscribing: ^sqoon.*

But I continue to receive them.

Any idea on how to amend the regex or outright block them from even send subscription requests?

The list is metawiki-admins, a closed list.

Regards, M.
M. A.