Block .ru on post

[NZ_Kiwis]

I'm getting a lot of email address like @.ru how can i block these when a user puts it in a form and posts it???

Also how can i block @.com if I wanted?

[NZ_Kiwis]

I must add on the ru one something is always different do i can not split it just at @ if that's at all possible?

[bradgrafelman]

You can get just the domain of the e-mail by doing this:

list(,$domain) = explode('@', $email);

[alimadzi]

Then you could use preg_match() to match the domains you don't want:

if ( preg_match ('/(hotmail\.com|\.ru)$/i', $domain) ) {
  // bounce or show error message
} else {
  // send the e-mail
}

This would work fine for blacklisting a few domains, but if you need to add a lot more you should do something more scalable. Perhaps a text file with one domain per line and a PHP function that loads the text file into an array and then checks the domain against each element. Or you could go all the way to a database-driven solution with an admin screen for updating your blacklist. It's all up to you...