Add PHP Mime Mail Parser - https://github.com/php/pecl-mail-mailparse

plugins/php-mime-mail-parser/src/Contracts/CharsetManager.php

@@ -0,0 +1,24 @@
+<?php namespace PhpMimeMailParser\Contracts;
+
+interface CharsetManager
+{
+
+    /**
+     * Decode the string from Charset
+     *
+     * @param string $encodedString The string in its original encoded state
+     * @param string $charset       The Charset header of the part.
+     *
+     * @return string The decoded string
+     */
+    public function decodeCharset($encodedString, $charset);
+
+    /**
+     * Get charset alias
+     *
+     * @param string $charset .
+     *
+     * @return string The charset alias
+     */
+    public function getCharsetAlias($charset);
+}

plugins/php-mime-mail-parser/src/Contracts/Middleware.php

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+<?php
+
+namespace PhpMimeMailParser\Contracts;
+
+use PhpMimeMailParser\MimePart;
+use PhpMimeMailParser\MiddlewareStack;
+
+/**
+ * Process Mime parts by either:
+ *  processing the part or calling the $next MiddlewareStack
+ */
+interface Middleware
+{
+    /**
+     *  Process a mime part, optionally delegating parsing to the $next MiddlewareStack
+     *
+     * @param MimePart $part
+     * @param MiddlewareStack $next
+     *
+     * @return MimePart
+     */
+    public function parse(MimePart $part, MiddlewareStack $next);
+}