XF 1.5 Best way to handle returning spammers?

[empire]

Got this message from an admin and am not sure of the answer. It's about spammers that keep coming back:

Anh046214 - nguyenthanhnhuhongngocv.iendong@gmail.com
Anh124824 - nguyenthanhnhuhongngoc.viendong@gmail.com
both 118.70.22.196 (already a banned IP)

Bao924558 - nguyenthanhnhu.hongngocviendong@gmail.com
42.117.204.47 (already a banned IP)

Mai823740- nguyenthanh nhuhongngocviend.ong@gmail.com
118.70.22.196

We get Spam Logs under the entry like:
StopForumSpam matched (email: 206, ip: 1)
Or just the email match if it's a new IP variation

latest one from this morning (using IP already banned)
Mai823740 (nguyenthanhnhuhongngocviend.ong@gmail.com)
118.70.22.196

Since this yodel has been coming back and back, I'm thinking that banning the various emails would be a better tack than the IPs, which doesn't seem to deny applying. But given how he/she moves periods and spaces around in the email addies, are there any wildcards we could use to limit the total number of entries I'd have to make?

 

[Mike]

Unfortunately each permutation would be required. (They're actually the same email because of a Gmail-specific design decision, so it's not necessarily generalizable.)

 

[empire]

ok thanks @Mike!