Set from name when $can_send_as_user is true

Test Plan: Crossed fingers.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8694

Author: sophiebits

src/applications/metamta/storage/PhabricatorMetaMTAMail.php

@@ -363,7 +363,7 @@ public function sendNow(
               PhabricatorEnv::getEnvConfig('metamta.can-send-as-user');
 
             if ($can_send_as_user) {
-              $mailer->setFrom($actor_email);
+              $mailer->setFrom($actor_email, $actor_name);
             } else {
               $from_email = coalesce($actor_email, $default_from);
               $from_name = coalesce($actor_name, pht('Phabricator'));