diff --git a/resources/sql/autopatches/20250227.paste.01.mailkey.php b/resources/sql/autopatches/20250227.paste.01.mailkey.php
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20250227.paste.01.mailkey.php
@@ -0,0 +1,34 @@
+<?php
+
+$paste_table = new PhabricatorPaste();
+$paste_conn = $paste_table->establishConnection('w');
+
+$properties_table = new PhabricatorMetaMTAMailProperties();
+$conn = $properties_table->establishConnection('w');
+
+$iterator = new LiskRawMigrationIterator(
+  $paste_conn,
+  $paste_table->getTableName());
+
+foreach ($iterator as $row) {
+  // The mailKey field might be unpopulated.
+  // This should have happened in the 20130805.pastemailkeypop.php migration,
+  // but that will not work on newer installations, because the paste table
+  // was renamed in between.
+  $mailkey = $row['mailKey'] ?? Filesystem::readRandomCharacters(20);
+
+  queryfx(
+    $conn,
+    'INSERT IGNORE INTO %T
+        (objectPHID, mailProperties, dateCreated, dateModified)
+      VALUES
+        (%s, %s, %d, %d)',
+    $properties_table->getTableName(),
+    $row['phid'],
+    phutil_json_encode(
+      array(
+        'mailKey' => $mailkey,
+      )),
+    PhabricatorTime::getNow(),
+    PhabricatorTime::getNow());
+}
diff --git a/resources/sql/autopatches/20250227.paste.02.mailkey.sql b/resources/sql/autopatches/20250227.paste.02.mailkey.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20250227.paste.02.mailkey.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_paste.paste
+  DROP mailKey;
diff --git a/src/applications/paste/storage/PhabricatorPaste.php b/src/applications/paste/storage/PhabricatorPaste.php
--- a/src/applications/paste/storage/PhabricatorPaste.php
+++ b/src/applications/paste/storage/PhabricatorPaste.php
@@ -22,7 +22,6 @@
   protected $parentPHID;
   protected $viewPolicy;
   protected $editPolicy;
-  protected $mailKey;
   protected $status;
   protected $spacePHID;
 
@@ -74,7 +73,6 @@
         'status' => 'text32',
         'title' => 'text255',
         'language' => 'text64?',
-        'mailKey' => 'bytes20',
         'parentPHID' => 'phid?',
 
         // T6203/NULLABILITY
@@ -107,13 +105,6 @@
     return ($this->getStatus() == self::STATUS_ARCHIVED);
   }
 
-  public function save() {
-    if (!$this->getMailKey()) {
-      $this->setMailKey(Filesystem::readRandomCharacters(20));
-    }
-    return parent::save();
-  }
-
   public function getFullName() {
     $title = $this->getTitle();
     if (!$title) {