laravel 5.4 embed image in mail
It seems that the older $message->embed doesn't work nicely with Markdown emails. Like you mentioned in the comments it seems broken since 5.4
But you could just try it like this inside your markdown email:
This is your logo
![Some option text][logo]
[logo]: {{asset('/img/official_logo.png')}} "Logo"
Like shown here: https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#images
Asset function reference: https://laravel.com/docs/5.4/helpers#method-asset
Try this:
<img src="data:image/png;base64,{{base64_encode(file_get_contents(resource_path('img/email/logo.png')))}}" alt="">
or
))}})