Yes, it actually contacts the server to make sure the address is valid and usable. http://drupal.org/project/email_verify
To use it with comments (patch): http://drupal.org/node/458758
A tip to use with any form: http://drupal.org/node/898726 Nancy Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
From: Shérab
I'll mention one that probably no one else will: Email Verify.
Close enough to my own suggestion ! :-) But I didn't knowit was possible to verify e-mail validity beyond purely syntactic verification.
It checks to see if they enter a validand reachableemail address. It has no visible component, so it may not even be on your radar, but I consider it indispensable in the war against spam.
It is for sure helpful !
Could you provide pointers ?