diff --git a/src/mibew/libs/classes/Mibew/Controller/Chat/MailController.php b/src/mibew/libs/classes/Mibew/Controller/Chat/MailController.php
index 9d11df86..877c74b9 100644
--- a/src/mibew/libs/classes/Mibew/Controller/Chat/MailController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/Chat/MailController.php
@@ -96,7 +96,7 @@ class MailController extends AbstractController
         $group = is_null($thread->groupId) ? null : group_by_id($thread->groupId);
         if (!$email) {
             $errors[] = no_field('Your email');
-        } elseif (!is_valid_email($email)) {
+        } elseif (!MailUtils::isValidAddress($email)) {
             $errors[] = wrong_field('Your email');
         }
 
diff --git a/src/mibew/libs/classes/Mibew/Controller/Group/SettingsController.php b/src/mibew/libs/classes/Mibew/Controller/Group/SettingsController.php
index 9ee24ba5..a923decc 100644
--- a/src/mibew/libs/classes/Mibew/Controller/Group/SettingsController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/Group/SettingsController.php
@@ -20,6 +20,7 @@
 namespace Mibew\Controller\Group;
 
 use Mibew\Http\Exception\NotFoundException;
+use Mibew\Mail\Utils as MailUtils;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -136,7 +137,7 @@ class SettingsController extends AbstractController
             $errors[] = no_field("Name");
         }
 
-        if ($email != '' && !is_valid_email($email)) {
+        if ($email != '' && !MailUtils::isValidAddress($email)) {
             $errors[] = wrong_field("E-mail");
         }
 
diff --git a/src/mibew/libs/classes/Mibew/Controller/Operator/ProfileController.php b/src/mibew/libs/classes/Mibew/Controller/Operator/ProfileController.php
index 99276798..a2f39b01 100644
--- a/src/mibew/libs/classes/Mibew/Controller/Operator/ProfileController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/Operator/ProfileController.php
@@ -20,6 +20,7 @@
 namespace Mibew\Controller\Operator;
 
 use Mibew\Http\Exception\NotFoundException;
+use Mibew\Mail\Utils as MailUtils;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -147,7 +148,7 @@ class ProfileController extends AbstractController
             }
         }
 
-        if (!$email || !is_valid_email($email)) {
+        if (!$email || !MailUtils::isValidAddress($email)) {
             $errors[] = wrong_field('E-mail');
         }
 
diff --git a/src/mibew/libs/classes/Mibew/Controller/PasswordRecoveryController.php b/src/mibew/libs/classes/Mibew/Controller/PasswordRecoveryController.php
index f441b182..80689989 100644
--- a/src/mibew/libs/classes/Mibew/Controller/PasswordRecoveryController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/PasswordRecoveryController.php
@@ -56,7 +56,7 @@ class PasswordRecoveryController extends AbstractController
         if ($request->request->has('loginoremail')) {
             $login_or_email = $request->request->get('loginoremail');
 
-            $to_restore = is_valid_email($login_or_email)
+            $to_restore = MailUtils::isValidAddress($login_or_email)
                 ? operator_by_email($login_or_email)
                 : operator_by_login($login_or_email);
             if (!$to_restore) {
@@ -64,7 +64,7 @@ class PasswordRecoveryController extends AbstractController
             }
 
             $email = $to_restore['vcemail'];
-            if (count($page['errors']) == 0 && !is_valid_email($email)) {
+            if (count($page['errors']) == 0 && !MailUtils::isValidAddress($email)) {
                 $page['errors'][] = "Operator hasn't set his e-mail";
             }
 
diff --git a/src/mibew/libs/classes/Mibew/Controller/Settings/CommonController.php b/src/mibew/libs/classes/Mibew/Controller/Settings/CommonController.php
index c6f1a217..06d160c1 100644
--- a/src/mibew/libs/classes/Mibew/Controller/Settings/CommonController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/Settings/CommonController.php
@@ -20,6 +20,7 @@
 namespace Mibew\Controller\Settings;
 
 use Mibew\Http\Exception\BadRequestException;
+use Mibew\Mail\Utils as MailUtils;
 use Mibew\Settings;
 use Mibew\Style\ChatStyle;
 use Mibew\Style\InvitationStyle;
@@ -153,7 +154,7 @@ class CommonController extends AbstractController
             $params['left_messages_locale'] = get_home_locale();
         }
 
-        if ($params['email'] && !is_valid_email($params['email'])) {
+        if ($params['email'] && !MailUtils::isValidAddress($params['email'])) {
             $errors[] = getlocal('Enter a valid email address');
         }
 
diff --git a/src/mibew/libs/classes/Mibew/Mail/Utils.php b/src/mibew/libs/classes/Mibew/Mail/Utils.php
index e1f9339c..91b505c0 100644
--- a/src/mibew/libs/classes/Mibew/Mail/Utils.php
+++ b/src/mibew/libs/classes/Mibew/Mail/Utils.php
@@ -26,6 +26,17 @@ use Symfony\Component\Yaml\Parser as YamlParser;
  */
 class Utils
 {
+    /**
+     * Checks if the passed in e-mail address is valid.
+     *
+     * @param string $address E-mail address to check.
+     * @return boolean
+     */
+    public static function isValidAddress($address)
+    {
+        return (bool)filter_var($address, FILTER_VALIDATE_EMAIL);
+    }
+
     /**
      * Builds an instance of \Swift_message.
      *
diff --git a/src/mibew/libs/classes/Mibew/RequestProcessor/ThreadProcessor.php b/src/mibew/libs/classes/Mibew/RequestProcessor/ThreadProcessor.php
index dc2fed35..26b5b396 100644
--- a/src/mibew/libs/classes/Mibew/RequestProcessor/ThreadProcessor.php
+++ b/src/mibew/libs/classes/Mibew/RequestProcessor/ThreadProcessor.php
@@ -744,7 +744,7 @@ class ThreadProcessor extends ClientSideProcessor implements
         $info = $args['info'];
         $referrer = $args['referrer'];
 
-        if (!is_valid_email($email)) {
+        if (!MailUtils::isValidAddress($email)) {
             throw new ThreadProcessorException(
                 wrong_field("Your email"),
                 ThreadProcessorException::ERROR_WRONG_EMAIL
diff --git a/src/mibew/libs/common/verification.php b/src/mibew/libs/common/verification.php
index cdd18053..43563f8f 100644
--- a/src/mibew/libs/common/verification.php
+++ b/src/mibew/libs/common/verification.php
@@ -37,8 +37,3 @@ function verify_param($name, $reg_exp, $default = null)
     echo "<html><head></head><body>Wrong parameter used or absent: " . $name . "</body></html>";
     exit;
 }
-
-function is_valid_email($email)
-{
-    return (bool)filter_var($email, FILTER_VALIDATE_EMAIL);
-}