additional_message_headers.php
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additional_message_headers.php
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	<?php

	/**
	* Additional Message Headers
	*
	* Very simple plugin which will add additional headers
	* to or remove them from outgoing messages.
	*
	* Enable the plugin in config.inc.php and add your desired headers:
	* $config['additional_message_headers'] = ['User-Agent' => 'My-Very-Own-Webmail'];
	*
	* @author Ziba Scott
	* @website http://roundcube.net
	*/
	class additional_message_headers extends rcube_plugin
	{
	/**
	* Plugin initialization
	*/
	function init()
	{
	$this->add_hook('message_before_send', [$this, 'message_headers']);
	}

	/**
	* 'message_before_send' hook handler
	*
	* @param array $args Hook arguments
	*
	* @return array Modified hook arguments
	*/
	function message_headers($args)
	{
	$this->load_config();

	$rcube = rcube::get_instance();

	// additional email headers
	$additional_headers = $rcube->config->get('additional_message_headers', []);

	if (!empty($additional_headers)) {
	$args['message']->headers($additional_headers, true);
	}

	return $args;
	}
	}