correct synax to ban email domain

[mindhunter77]

What is the correct way to ban an email domain. I guess the way I'm doing that now is wrong as people can still singup with the domains..

is it


*spammer.com
spammer.com
@spammer.com

or is it one I'm totally missing?

--------------- Added 1234402428 at 1234402428 ---------------

Buler,....Buler,....

[Dismounted]

The second or last one will both work.

[Marco van Herwaarden]

As in the description, it is matched from the end:

*spammer.com
This is not a valid entry, you can not use wildcards.

spammer.com
Will ban (deny) any email address ending in the above, so it will block:
spammer@spammer.com
spammer@iamaspammer.com

@spammer.com will block:
spammer@spammer.com

But it will not block
spammer@iamaspammer.com

[mindhunter77]

I see, thank you for the explanation.