Kyoushu/InlineSwiftmailerTransport 
A SwiftMailer transport which inlines CSS before forwarding the message to another transport for delivery, (*1)
Filters
Inline Embedded CSS
This filter is loaded automatically when an instance of InlineTransport is created, (*2)
Example
$deliveryTransport = new \Swift_SmtpTransport('localhost', 25);
$transport = new InlineTransport($deliveryTransport, new \Swift_Events_SimpleEventDispatcher());
$message = new \Swift_Message('Foo', '<html><head><style>p{ font-weight: bold; }</style></head><body><p>Foo</p></body></html>', 'text/html');
$transport->send($message);
Body sent via delivery transport, (*3)
<html><head><style>p{ font-weight: bold; }</style></head><body><p style="font-weight: bold;">Foo</p></body></html>
Inline Included CSS
If you want to inline CSS included with <link> elements, rather than CSS which has been embedded with <style> elements, use the InlineCssMessageFilter class., (*4)
Example
$webRootDir = '/path/to/my/web/root/dir';
$deliveryTransport = new \Swift_SmtpTransport('localhost', 25);
$transport = new InlineTransport($deliveryTransport, new \Swift_Events_SimpleEventDispatcher());
$transport->addMessageFilter(new InlineCssMessageFilter($webRootDir));
$message = new \Swift_Message('Foo', '<html><head><link rel="stylesheet" href="/css/email.css"></head><body><p>Foo</p></body></html>', 'text/html');
$transport->send($message);
Embed Images
Example
<img> elements with absolute src attributes are embedded, and updated with "cid:########" values., (*5)
$webRootDir = '/path/to/my/web/root/dir';
$deliveryTransport = new \Swift_SmtpTransport('localhost', 25);
$transport = new InlineTransport($deliveryTransport, new \Swift_Events_SimpleEventDispatcher());
$transport->addMessageFilter(new EmbedImageMessageFilter($webRootDir));
$message = new \Swift_Message('Foo', '<html><body><img src="/images/my-image.png"</body></html>', 'text/html');
$transport->send($message);
Body sent via delivery transport, (*6)
<html><body><img src="cid:09F48ag2b674"</body></html>
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