Core/DBLayer: Convert PAppend() queries to prepared statements No.4 NOTE:

Most of the cores queries have been converted to prepared statements now. If your code contains queries, please either use the exiting or implement new statements.
The only exclusions are one-time queries (e.g. for core startup) and queries that can't be prepared due to limitations.

src/server/game/Handlers/MailHandler.cpp

@@ -375,7 +375,7 @@ void WorldSession::HandleMailReturnToSender(WorldPacket & recv_data)
     //so firstly delete the old one
     SQLTransaction trans = CharacterDatabase.BeginTransaction();
 
-    PreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_MAIL);
+    PreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_MAIL_BY_ID);
     stmt->setUInt32(0, mailId);
     trans->Append(stmt);