If I can ask, what is the purpose of blocking those email hosts? You've listed three very popular domains which could lead to excluding a very large number of potential users. There may be an entirely legitimate reason to do so; I'm just curious.

Gotcha; makes perfect sense. I'm assuming, then, that students would send the messages using a school-based email address (me@mydistrict.edu or somesuch). I'm definitely not a wizard when it comes to regular expressions, but I found this thread:

http://www.phpfreaks.com/forums/index.php?topic=137584

which seems to be along the lines of what you're looking for. The final script in that thread excludes a certain domain, but if all the legitimate messages would come from one domain, you could also modify it to only accept that one domain.

Hope it helps. :)

Chris

Thanks for the help and suggestions. Since this is a public site and there are many schools with their own domain, I am thinking just adding a few common email domains would make the most sense.

I think I'm getting closer to resolving this. I added "if(strpos(strtolower..." (see code below) but I get the error "Parse error: syntax error, unexpected" when using this code. Any ideas on why? Or what I am missing?

<?php
function wpcf7_text_validation_filter( $result, $tag ) {
$type = $tag['type'];
$name = $tag['name'];

$_POST[$name] = trim( strtr( (string) $_POST[$name], "\n", " " ) );
if ( 'text*' == $type ) {
if ( '' == $_POST[$name] ) {
$result['valid'] = false;
$result['reason'][$name] = wpcf7_get_message( 'invalid_required' );
}
}

if ( 'email' == $type || 'email*' == $type ) {
if ( 'email*' == $type && '' == $_POST[$name] ) {
$result['valid'] = false;
$result['reason'][$name] = wpcf7_get_message( 'invalid_required' );
}

if(strpos(strtolower( '' != $_POST[$name] && ! is_email( $_POST[$name] ),'happy@happy.com') ){
$result['valid'] = false;
$result['reason'][$name] = wpcf7_get_message( 'invalid_email' );
}
}elseif ( '' != $_POST[$name] && ! is_email( $_POST[$name] ) ) {
$result['valid'] = false;
$result['reason'][$name] = wpcf7_get_message( 'invalid_email' );
}
}
return $result;
}
?>

This is a public site and not specific to any one school. Anybody can use the site. To collect and manage every teacher's email address from every school would be very cumbersome. If there is a way to block gmail, yahoo and hotmail email accounts that would be greatly helpful. Here is the link to the site in case anyone wants to check it out. http://bongokidz.com/report-bullying/

Thanks!

I attempted to do something like this but it was rather advanced for my php skills. However, on WP's forum I found a member who was extremely helpful and he provided the coded which was one of the methods I was attempting to use. Here is the link for those who may need it.

Please note that this is for the Contact Form 7 plugin in WP and you'll need to modify the text.php file under the Validation filter comment (line 113) in the modules folder.

Thank you ccc630 for all your suggestions, they were very helpful and I learned a little more about php.