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include/swiftmailer/lib/classes/Swift/IdGenerator.php

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+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Message ID generator.
+ */
+interface Swift_IdGenerator
+{
+    /**
+     * Returns a globally unique string to use for Message-ID or Content-ID.
+     *
+     * @return string
+     */
+    public function generateId();
+}