diff --git a/resources/sql/autopatches/20140201.gc.1.mailsent.sql b/resources/sql/autopatches/20140201.gc.1.mailsent.sql
new file mode 100644
index 0000000000..21254ca890
--- /dev/null
+++ b/resources/sql/autopatches/20140201.gc.1.mailsent.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_metamta.metamta_mail
+  ADD KEY `key_created` (dateCreated);
diff --git a/resources/sql/autopatches/20140201.gc.2.mailreceived.sql b/resources/sql/autopatches/20140201.gc.2.mailreceived.sql
new file mode 100644
index 0000000000..e9de922182
--- /dev/null
+++ b/resources/sql/autopatches/20140201.gc.2.mailreceived.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_metamta.metamta_receivedmail
+  ADD KEY `key_created` (dateCreated);
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 2692f975ce..0e9fc51898 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -923,6 +923,8 @@ phutil_register_library_map(array(
     'ManiphestTransactionSaveController' => 'applications/maniphest/controller/ManiphestTransactionSaveController.php',
     'ManiphestView' => 'applications/maniphest/view/ManiphestView.php',
     'MetaMTAConstants' => 'applications/metamta/constants/MetaMTAConstants.php',
+    'MetaMTAMailReceivedGarbageCollector' => 'applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php',
+    'MetaMTAMailSentGarbageCollector' => 'applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php',
     'MetaMTANotificationType' => 'applications/metamta/constants/MetaMTANotificationType.php',
     'MetaMTAReceivedMailStatus' => 'applications/metamta/constants/MetaMTAReceivedMailStatus.php',
     'NuanceCapabilitySourceDefaultEdit' => 'applications/nuance/capability/NuanceCapabilitySourceDefaultEdit.php',
@@ -3513,6 +3515,8 @@ phutil_register_library_map(array(
     'ManiphestTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'ManiphestTransactionSaveController' => 'ManiphestController',
     'ManiphestView' => 'AphrontView',
+    'MetaMTAMailReceivedGarbageCollector' => 'PhabricatorGarbageCollector',
+    'MetaMTAMailSentGarbageCollector' => 'PhabricatorGarbageCollector',
     'MetaMTANotificationType' => 'MetaMTAConstants',
     'MetaMTAReceivedMailStatus' => 'MetaMTAConstants',
     'NuanceCapabilitySourceDefaultEdit' => 'PhabricatorPolicyCapability',
diff --git a/src/applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php b/src/applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php
new file mode 100644
index 0000000000..02911354b5
--- /dev/null
+++ b/src/applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php
@@ -0,0 +1,21 @@
+<?php
+
+final class MetaMTAMailReceivedGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $ttl = phutil_units('90 days in seconds');
+
+    $table = new PhabricatorMetaMTAReceivedMail();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
+      $table->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}
diff --git a/src/applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php b/src/applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php
new file mode 100644
index 0000000000..b4d4b05b76
--- /dev/null
+++ b/src/applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php
@@ -0,0 +1,21 @@
+<?php
+
+final class MetaMTAMailSentGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $ttl = phutil_units('90 days in seconds');
+
+    $table = new PhabricatorMetaMTAMail();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
+      $table->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}