diff --git a/core/lib/Drupal/Core/Mail/MailInterface.php b/core/lib/Drupal/Core/Mail/MailInterface.php
index 64573ad..24eb863 100644
--- a/core/lib/Drupal/Core/Mail/MailInterface.php
+++ b/core/lib/Drupal/Core/Mail/MailInterface.php
@@ -53,8 +53,8 @@ public function format(array $message);
    *   - subject: Subject of the email to be sent. This must not contain any
    *     newline characters, or the mail may not be sent properly.
    *   - body: Message to be sent. Accepts both CRLF and LF line-endings.
-   *     Email bodies must be wrapped. You can use drupal_wrap_mail() for
-   *     smart plain text wrapping.
+   *     Email bodies must be wrapped. You can use \Drupal\Core\Mail\MailFormatHelper::wrapMail()
+   *     for smart plain text wrapping.
    *   - headers: Associative array containing all additional mail headers not
    *     defined by one of the other parameters.  PHP's mail() looks for Cc and
    *     Bcc headers and sends the mail to addresses in these headers too.
diff --git a/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php b/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php
index caa2af3..9899834 100644
--- a/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php
+++ b/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php
@@ -8,6 +8,7 @@
 namespace Drupal\Core\Mail\Plugin\Mail;
 
 use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Mail\MailFormatHelper;
 use Drupal\Core\Mail\MailInterface;
 use Drupal\Core\Site\Settings;
 
@@ -37,7 +38,7 @@ public function format(array $message) {
     // Convert any HTML to plain-text.
     $message['body'] = drupal_html_to_text($message['body']);
     // Wrap the mail body for sending.
-    $message['body'] = drupal_wrap_mail($message['body']);
+    $message['body'] = MailFormatHelper::wrapMail($message['body']);
 
     return $message;
   }
diff --git a/core/modules/system/src/Tests/Mail/HtmlToTextTest.php b/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
index e48ba42..b4edee6 100644
--- a/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
+++ b/core/modules/system/src/Tests/Mail/HtmlToTextTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\system\Tests\Mail;
 
 use Drupal\Component\Utility\String;
+use Drupal\Core\Mail\MailFormatHelper;
 use Drupal\Core\Site\Settings;
 use Drupal\simpletest\WebTestBase;
 
@@ -358,28 +359,29 @@ public function testVeryLongLineWrap() {
   }
 
   /**
-   * Tests that drupal_wrap_mail() removes trailing whitespace before newlines.
+   * Tests that trailing whitespace is removed before newlines.
+   * @see \Drupal\Core\Mail\MailFormatHelper::wrapMail()
    */
   public function testRemoveTrailingWhitespace() {
     $text = "Hi there! \nHerp Derp";
-    $mail_lines = explode("\n", drupal_wrap_mail($text));
+    $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
     $this->assertNotEqual(" ", substr($mail_lines[0], -1), 'Trailing whitespace removed.');
   }
 
   /**
-   * Tests that drupal_wrap_mail() does not remove the trailing whitespace from
-   * Usenet style signatures.
+   * Tests that \Drupal\Core\Mail\MailFormatHelper::wrapMail() does not remove
+   * the trailing whitespace from Usenet style signatures.
    *
    * RFC 3676 says, "This is a special case; an (optionally quoted or quoted and
    * stuffed) line consisting of DASH DASH SP is neither fixed nor flowed."
    */
   public function testUsenetSignature() {
     $text = "Hi there!\n-- \nHerp Derp";
-    $mail_lines = explode("\n", drupal_wrap_mail($text));
+    $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
     $this->assertEqual("-- ", $mail_lines[1], 'Trailing whitespace not removed for dash-dash-space signatures.');
 
     $text = "Hi there!\n--  \nHerp Derp";
-    $mail_lines = explode("\n", drupal_wrap_mail($text));
+    $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
     $this->assertEqual("--", $mail_lines[1], 'Trailing whitespace removed for incorrect dash-dash-space signatures.');
   }
 }
diff --git a/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php b/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
index f1f4258..a0dd6ae 100644
--- a/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
+++ b/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
@@ -17,7 +17,7 @@
 class MailFormatHelperTest extends UnitTestCase {
 
   /**
-   * Makes sure that drupal_wrap_mail() wraps the correct types of lines.
+   * @covers ::wrapMail
    */
   public function testWrapMail() {
     $delimiter = "End of header\n";