diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1361,6 +1361,7 @@
     'PhabricatorAuthInviteSearchEngine' => 'applications/auth/query/PhabricatorAuthInviteSearchEngine.php',
     'PhabricatorAuthInviteTestCase' => 'applications/auth/factor/__tests__/PhabricatorAuthInviteTestCase.php',
     'PhabricatorAuthInviteVerifyException' => 'applications/auth/exception/PhabricatorAuthInviteVerifyException.php',
+    'PhabricatorAuthInviteWorker' => 'applications/auth/worker/PhabricatorAuthInviteWorker.php',
     'PhabricatorAuthLinkController' => 'applications/auth/controller/PhabricatorAuthLinkController.php',
     'PhabricatorAuthListController' => 'applications/auth/controller/config/PhabricatorAuthListController.php',
     'PhabricatorAuthLoginController' => 'applications/auth/controller/PhabricatorAuthLoginController.php',
@@ -2626,6 +2627,7 @@
     'PhabricatorWorkerDAO' => 'infrastructure/daemon/workers/storage/PhabricatorWorkerDAO.php',
     'PhabricatorWorkerLeaseQuery' => 'infrastructure/daemon/workers/query/PhabricatorWorkerLeaseQuery.php',
     'PhabricatorWorkerManagementCancelWorkflow' => 'infrastructure/daemon/workers/management/PhabricatorWorkerManagementCancelWorkflow.php',
+    'PhabricatorWorkerManagementExecuteWorkflow' => 'infrastructure/daemon/workers/management/PhabricatorWorkerManagementExecuteWorkflow.php',
     'PhabricatorWorkerManagementFloodWorkflow' => 'infrastructure/daemon/workers/management/PhabricatorWorkerManagementFloodWorkflow.php',
     'PhabricatorWorkerManagementFreeWorkflow' => 'infrastructure/daemon/workers/management/PhabricatorWorkerManagementFreeWorkflow.php',
     'PhabricatorWorkerManagementRetryWorkflow' => 'infrastructure/daemon/workers/management/PhabricatorWorkerManagementRetryWorkflow.php',
@@ -4591,6 +4593,7 @@
     'PhabricatorAuthInviteSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'PhabricatorAuthInviteTestCase' => 'PhabricatorTestCase',
     'PhabricatorAuthInviteVerifyException' => 'PhabricatorAuthInviteDialogException',
+    'PhabricatorAuthInviteWorker' => 'PhabricatorWorker',
     'PhabricatorAuthLinkController' => 'PhabricatorAuthController',
     'PhabricatorAuthListController' => 'PhabricatorAuthProviderConfigController',
     'PhabricatorAuthLoginController' => 'PhabricatorAuthController',
@@ -5959,6 +5962,7 @@
     'PhabricatorWorkerDAO' => 'PhabricatorLiskDAO',
     'PhabricatorWorkerLeaseQuery' => 'PhabricatorQuery',
     'PhabricatorWorkerManagementCancelWorkflow' => 'PhabricatorWorkerManagementWorkflow',
+    'PhabricatorWorkerManagementExecuteWorkflow' => 'PhabricatorWorkerManagementWorkflow',
     'PhabricatorWorkerManagementFloodWorkflow' => 'PhabricatorWorkerManagementWorkflow',
     'PhabricatorWorkerManagementFreeWorkflow' => 'PhabricatorWorkerManagementWorkflow',
     'PhabricatorWorkerManagementRetryWorkflow' => 'PhabricatorWorkerManagementWorkflow',
diff --git a/src/applications/auth/data/PhabricatorAuthInviteAction.php b/src/applications/auth/data/PhabricatorAuthInviteAction.php
--- a/src/applications/auth/data/PhabricatorAuthInviteAction.php
+++ b/src/applications/auth/data/PhabricatorAuthInviteAction.php
@@ -189,4 +189,22 @@
     return $results;
   }
 
+  public function sendInvite(PhabricatorUser $actor, $template) {
+    if (!$this->willSend()) {
+      throw new Exception(pht('Invite action is not a send action!'));
+    }
+
+    if (!preg_match('/{\$INVITE_URI}/', $template)) {
+      throw new Exception(pht('Invite template does not include invite URI!'));
+    }
+
+    PhabricatorWorker::scheduleTask(
+      'PhabricatorAuthInviteWorker',
+      array(
+        'address' => $this->getEmailAddress(),
+        'template' => $template,
+        'authorPHID' => $actor->getPHID(),
+      ));
+  }
+
 }
diff --git a/src/applications/auth/engine/PhabricatorAuthInviteEngine.php b/src/applications/auth/engine/PhabricatorAuthInviteEngine.php
--- a/src/applications/auth/engine/PhabricatorAuthInviteEngine.php
+++ b/src/applications/auth/engine/PhabricatorAuthInviteEngine.php
@@ -35,9 +35,10 @@
   public function processInviteCode($code) {
     $viewer = $this->getViewer();
 
-    $invite = id(new PhabricatorAuthInvite())->loadOneWhere(
-      'verificationHash = %s',
-      PhabricatorHash::digestForIndex($code));
+    $invite = id(new PhabricatorAuthInviteQuery())
+      ->setViewer($viewer)
+      ->withVerificationCodes(array($code))
+      ->executeOne();
     if (!$invite) {
       throw id(new PhabricatorAuthInviteInvalidException(
         pht('Bad Invite Code'),
diff --git a/src/applications/auth/query/PhabricatorAuthInviteQuery.php b/src/applications/auth/query/PhabricatorAuthInviteQuery.php
--- a/src/applications/auth/query/PhabricatorAuthInviteQuery.php
+++ b/src/applications/auth/query/PhabricatorAuthInviteQuery.php
@@ -88,6 +88,7 @@
       foreach ($this->verificationCodes as $code) {
         $hashes[] = PhabricatorHash::digestForIndex($code);
       }
+
       $where[] = qsprintf(
         $conn_r,
         'verificationHash IN (%Ls)',
diff --git a/src/applications/auth/query/PhabricatorAuthInviteSearchEngine.php b/src/applications/auth/query/PhabricatorAuthInviteSearchEngine.php
--- a/src/applications/auth/query/PhabricatorAuthInviteSearchEngine.php
+++ b/src/applications/auth/query/PhabricatorAuthInviteSearchEngine.php
@@ -86,7 +86,21 @@
       );
     }
 
-    $table = new AphrontTableView($rows);
+    $table = id(new AphrontTableView($rows))
+      ->setHeaders(
+        array(
+          pht('Email Address'),
+          pht('Sent By'),
+          pht('Accepted By'),
+          pht('Invited'),
+        ))
+      ->setColumnClasses(
+        array(
+          '',
+          '',
+          'wide',
+          'right',
+        ));
 
     return id(new PHUIObjectBoxView())
       ->setHeaderText(pht('Email Invitations'))
diff --git a/src/applications/auth/storage/PhabricatorAuthInvite.php b/src/applications/auth/storage/PhabricatorAuthInvite.php
--- a/src/applications/auth/storage/PhabricatorAuthInvite.php
+++ b/src/applications/auth/storage/PhabricatorAuthInvite.php
@@ -38,15 +38,21 @@
       PhabricatorAuthInvitePHIDType::TYPECONST);
   }
 
+  public function regenerateVerificationCode() {
+    $this->verificationCode = Filesystem::readRandomCharacters(16);
+    $this->verificationHash = null;
+    return $this;
+  }
+
   public function getVerificationCode() {
-    if (!$this->getVerificationHash()) {
+    if (!$this->verificationCode) {
       if ($this->verificationHash) {
         throw new Exception(
           pht(
             'Verification code can not be regenerated after an invite is '.
             'created.'));
       }
-      $this->verificationCode = Filesystem::readRandomCharacters(16);
+      $this->regenerateVerificationCode();
     }
     return $this->verificationCode;
   }
diff --git a/src/applications/auth/worker/PhabricatorAuthInviteWorker.php b/src/applications/auth/worker/PhabricatorAuthInviteWorker.php
new file mode 100644
--- /dev/null
+++ b/src/applications/auth/worker/PhabricatorAuthInviteWorker.php
@@ -0,0 +1,60 @@
+<?php
+
+final class PhabricatorAuthInviteWorker
+  extends PhabricatorWorker {
+
+  protected function doWork() {
+    $data = $this->getTaskData();
+    $viewer = PhabricatorUser::getOmnipotentUser();
+
+    $address = idx($data, 'address');
+    $author_phid = idx($data, 'authorPHID');
+
+    $author = id(new PhabricatorPeopleQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array($author_phid))
+      ->executeOne();
+    if (!$author) {
+      throw new PhabricatorWorkerPermanentFailureException(
+        pht('Invite has invalid author PHID ("%s").', $author_phid));
+    }
+
+    $invite = id(new PhabricatorAuthInviteQuery())
+      ->setViewer($viewer)
+      ->withEmailAddresses(array($address))
+      ->executeOne();
+    if ($invite) {
+      // If we're inviting a user who has already been invited, we just
+      // regenerate their invite code.
+      $invite->regenerateVerificationCode();
+    } else {
+      // Otherwise, we're creating a new invite.
+      $invite = id(new PhabricatorAuthInvite())
+        ->setEmailAddress($address);
+    }
+
+    // Whether this is a new invite or not, tag this most recent author as
+    // the invite author.
+    $invite->setAuthorPHID($author_phid);
+
+    $code = $invite->getVerificationCode();
+    $invite_uri = '/auth/invite/'.$code.'/';
+    $invite_uri = PhabricatorEnv::getProductionURI($invite_uri);
+
+    $template = idx($data, 'template');
+    $template = str_replace('{$INVITE_URI}', $invite_uri, $template);
+
+    $invite->save();
+
+    $mail = id(new PhabricatorMetaMTAMail())
+      ->addRawTos(array($invite->getEmailAddress()))
+      ->setForceDelivery(true)
+      ->setSubject(
+        pht(
+          '[Phabricator] %s has invited you to join Phabricator',
+          $author->getFullName()))
+      ->setBody($template)
+      ->saveAndSend();
+  }
+
+}
diff --git a/src/applications/people/controller/PhabricatorPeopleInviteSendController.php b/src/applications/people/controller/PhabricatorPeopleInviteSendController.php
--- a/src/applications/people/controller/PhabricatorPeopleInviteSendController.php
+++ b/src/applications/people/controller/PhabricatorPeopleInviteSendController.php
@@ -44,9 +44,8 @@
 
         $any_valid = false;
         $all_valid = true;
-        $action_send = PhabricatorAuthInviteAction::ACTION_SEND;
         foreach ($actions as $action) {
-          if ($action->getAction() == $action_send) {
+          if ($action->willSend()) {
             $any_valid = true;
           } else {
             $all_valid = false;
@@ -72,8 +71,44 @@
         }
 
         if ($any_valid && $request->getBool('confirm')) {
-          throw new Exception(
-            pht('TODO: This workflow is not yet fully implemented.'));
+
+          // TODO: The copywriting on this mail could probably be more
+          // engaging and we could have a fancy HTML version.
+
+          $template = array();
+          $template[] = pht(
+            '%s has invited you to join Phabricator.',
+            $viewer->getFullName());
+
+          if (strlen(trim($message))) {
+            $template[] = $message;
+          }
+
+          $template[] = pht(
+            'To register an account and get started, follow this link:');
+
+          // This isn't a variable; it will be replaced later on in the
+          // daemons once they generate the URI.
+          $template[] = '{$INVITE_URI}';
+
+          $template[] = pht(
+            'If you already have an account, you can follow the link to '.
+            'quickly verify this email address.');
+
+          $template = implode("\n\n", $template);
+
+          foreach ($actions as $action) {
+            if ($action->willSend()) {
+              $action->sendInvite($viewer, $template);
+            }
+          }
+
+          // TODO: This is a bit anticlimactic. We don't really have anything
+          // to show the user because the action is happening in the background
+          // and the invites won't exist yet. After T5166 we can show a
+          // better progress bar.
+          return id(new AphrontRedirectResponse())
+            ->setURI($this->getApplicationURI());
         }
       }
     }
diff --git a/src/infrastructure/daemon/workers/management/PhabricatorWorkerManagementExecuteWorkflow.php b/src/infrastructure/daemon/workers/management/PhabricatorWorkerManagementExecuteWorkflow.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/daemon/workers/management/PhabricatorWorkerManagementExecuteWorkflow.php
@@ -0,0 +1,61 @@
+<?php
+
+final class PhabricatorWorkerManagementExecuteWorkflow
+  extends PhabricatorWorkerManagementWorkflow {
+
+  protected function didConstruct() {
+    $this
+      ->setName('execute')
+      ->setExamples('**execute** --id __id__')
+      ->setSynopsis(
+        pht(
+          'Execute a task explicitly. This command ignores leases, is '.
+          'dangerous, and may cause work to be performed twice.'))
+      ->setArguments($this->getTaskSelectionArguments());
+  }
+
+  public function execute(PhutilArgumentParser $args) {
+    $console = PhutilConsole::getConsole();
+    $tasks = $this->loadTasks($args);
+
+    foreach ($tasks as $task) {
+      $can_execute = !$task->isArchived();
+      if (!$can_execute) {
+        $console->writeOut(
+          "**<bg:yellow> %s </bg>** %s\n",
+          pht('ARCHIVED'),
+          pht(
+            '%s is already archived, and can not be executed.',
+            $this->describeTask($task)));
+        continue;
+      }
+
+      // NOTE: This ignores leases, maybe it should respect them without
+      // a parameter like --force?
+
+      $task->setLeaseOwner(null);
+      $task->setLeaseExpires(PhabricatorTime::getNow());
+      $task->save();
+
+      $task_data = id(new PhabricatorWorkerTaskData())->loadOneWhere(
+        'id = %d',
+        $task->getDataID());
+      $task->setData($task_data->getData());
+
+      $id = $task->getID();
+      $class = $task->getTaskClass();
+
+      $console->writeOut("Executing task {$id} ({$class})...");
+
+      $task->executeTask();
+      $ex = $task->getExecutionException();
+
+      if ($ex) {
+        throw $ex;
+      }
+    }
+
+    return 0;
+  }
+
+}