final Intent shareIntent= new Intent(Intent.ACTION_SENDTO, Uri.parse("mailto:"));
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "The Subject");
shareIntent.putExtra(
Intent.EXTRA_TEXT,
Html.fromHtml(new StringBuilder()
.append("<p><b>Some Content</b></p>")
.append("<small><p>More content</p></small>")
.toString())
);
Even I have pasted this code from a solved question(How to send HTML email). Still not working in my case.
It looks like a regression in the GMail app. It was working fine before and now it's not working anymore. It might be a bug or it might have been disabled on purpose for security reasons... Anyway I don't think you'll be able to fix this on your side