email_verify.inc.php in Email Verify 6

Check the email for email_verify module.

File

email_verify.inc.php

<?php

/**
 * @file
 * Check the email for email_verify module.
 */
function _email_verify_check($mail) {
  if (!valid_email_address($mail)) {

    // The address is syntactically incorrect.
    // The problem will be caught by the 'user' module anyway, so we avoid
    // duplicating the error reporting here, just return.
    return;
  }
  include_once dirname(__FILE__) . '/windows_compat.inc';
  $host = substr(strchr($mail, '@'), 1);

  // Let's see if we can find anything about this host in the DNS
  if (!checkdnsrr($host, 'ANY')) {
    return t('Email host %host invalid, please retry.', array(
      '%host' => "{$host}",
    ));
  }

  // What SMTP servers should we contact?
  $mx_hosts = array();
  if (!getmxrr($host, $mx_hosts)) {

    // When there is no MX record, the host itself should be used
    $mx_hosts[] = $host;
  }

  // Try to connect to one SMTP server
  foreach ($mx_hosts as $smtp) {
    $connect = @fsockopen($smtp, 25, $errno, $errstr, 15);
    if (!$connect) {
      continue;
    }
    if (ereg("^220", $out = fgets($connect, 1024))) {

      // OK, we have a SMTP connection
      break;
    }
    else {

      // The SMTP server probably does not like us
      // (dynamic/residential IP for aol.com for instance)
      // Be on the safe side and accept the address, at least it has a valid
      // domain part...
      watchdog('email_verify', "Could not verify email address at host {$host}: {$out}");
      return;
    }
  }
  if (!$connect) {
    return t('Email host %host is invalid, please contact us for clarification.', array(
      '%host' => "{$host}",
    ));
  }
  $from = variable_get('site_mail', ini_get('sendmail_from'));

  // Extract the <...> part if there is one
  if (preg_match('/\\<(.*)\\>/', $from, $match) > 0) {
    $from = $match[1];
  }
  $localhost = $_SERVER["HTTP_HOST"];
  if (!$localhost) {

    // Happens with HTTP/1.0

    //should be good enough for RFC compliant SMTP servers
    $localhost = 'localhost';
  }
  fputs($connect, "HELO {$localhost}\r\n");
  $out = fgets($connect, 1024);
  fputs($connect, "MAIL FROM: <{$from}>\r\n");
  $from = fgets($connect, 1024);
  fputs($connect, "RCPT TO: <{$mail}>\r\n");
  $to = fgets($connect, 1024);
  fputs($connect, "QUIT\r\n");
  fclose($connect);
  if (!ereg("^250", $from)) {

    // Again, something went wrong before we could really test the address,
    // be on the safe side and accept it.
    watchdog('email_verify', "Could not verify email address at host {$host}: {$from}");
    return;
  }
  if (ereg("(Client host|Helo command) rejected", $to) || ereg("^4", $to) && !ereg("^450", $to)) {

    // In those cases, accept the email, but log a warning
    watchdog('email_verify', "Could not verify email address at host {$host}: {$to}");
    return;
  }
  if (!ereg("^250", $to)) {
    watchdog('email_verify', "Rejected email address: {$mail}. Reason: {$to}");
    return t('%mail is invalid, please contact us for clarification.', array(
      '%mail' => "{$mail}",
    ));
  }

  // Everything OK
  return;
}

Functions

Name	Description
_email_verify_check	@file Check the email for email_verify module.