Apply the wordwrap() hack for "To" to PHPMailerLite

Summary:
Fixes T12372. Long-term fix is T12404, this is a bandaid in the interim.

See T12372 for additional discussion.

Test Plan: Confirmed functional by a user in T12372.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12372

Differential Revision: https://secure.phabricator.com/D17501

externals/phpmailer/class.phpmailer-lite.php

@@ -656,6 +656,10 @@ class PHPMailerLite {
     $addr_str .= implode(', ', $addresses);
     $addr_str .= $this->LE;
 
+    // NOTE: This is a narrow hack to fix an issue with 1000+ characters of
+    // recipients, described in T12372.
+    $addr_str = wordwrap($addr_str, 75, "\n ");
+
     return $addr_str;
   }