I hit this missing “http:” in emails as well. Or maybe it is having two links. I have support for some not image file extensions (namely kmmacro). If I post a message with an image and a kmmacro file, the resulting email looks like this:
<a class=“attachment” href="/uploads/default/35/328db47796f9fad2.kmmacros">Reminder.kmmacros</a> (5.7 KB) <img src="/uploads/default/36/f43857831454a49a.png" width=“668” height=“1860”>
Which is clearly broken, its HTML even though its in the plain text section, and its missing the http:/ /forum.keyboardmaestro.com (deliberately added a space to avoid links) in the links.
And then the Content-Type: text/html section includes this:
<p style=“margin-top:0;”><a href="//forum.keyboardmaestro.com/uploads/default/35/328db47796f9fad2.kmmacros" style=“text-decoration: none; font-weight: bold; color: #006699;”>Reminder.kmmacros</a> (5.7 KB) <img src=“http://forum.keyboardmaestro.com/uploads/default/36/f43857831454a49a.png” width=“668” height=“1860” style=“max-width: 694px;”></p>
The “http:” is missing from the kmmacros link, but the image link is ok.
Does meta support any non-image file types? If so I can test that.