//Check valid web address public static bool EmailAddressExists(string emailAddress, string fromEmailAddress) { EmailValidator ev = new EmailValidator(); try { //Set the sender email (for smtp identification) ev.Mail_From = fromEmailAddress; //check if the email address is valid and really exists string errMsg = ev.Check_MailBox_Error(emailAddress); if (errMsg == "") { return(true); } else { return(false); } } catch { return(false); } }