Banning a serious of email addresses using a wild car

[attroll]

I am getting spammed by new registrations really bad on my forums.
They have found a way past my human verification.
It is easy for me to figure out who they are by their registration email address.
The have a revolving email address that ends with .xyz.
Here are samples of the type of email addresses I am getting.
@kunio99.dev256.xyz
@takayuki63.dev256.xyz
@yoichi7510.isamu10.investmentweb.xyz
@fumio7010.kaede45.investmentweb.xyz
@sora90.kiesag.xyzisamu4110.satoshi38.investmentweb.xyz
@kaede7410.takayuki52.funnetwork.xyz

I tried blocking the email in my ADMINCP in the User Banning Options.
In the Banned Email Address I tried putting the following text in but it will not ban it with the wildcard that I used
@*.xyz

How can I ban all email addresses ending with .xyz?

[Bat21]

Would simply putting .xyz in the email banning options work?

[djbaxter]

AdminCP >> Options >> User banning options >> Banned email addresses

Add .xyz

Set Aggressive Email Banning to Yes

[attroll]

I set it to .xyz and aggressive email banning and it seems to be working so far.

[Bat21]

Well done, I think you missed 'thank you' off the end

[attroll]

Well done, I think you missed 'thank you' off the end

I did not say "Thank you" because I was not sure it was working yet. At the time I said it seems to be working.
Now I know it is working. Thank you, the Aggressive Email Banning did the trick.

Now I have new emails popping up doing the same thing. The struggle never ends.