[Suggestion] HTML email support for mailer.php

Hi,

I’m writing some plugin with email feature, and found the “Content-Type” was hard-coded to “text/plain” in mailer.php:48.
Appending additional headers couldn’t override it.

It would be better if it could support Content-Type:text/html whenever $message_html is not null.

Thanks.

sure, could you file a PR for this? making it configurable and default to text/plain would be great.

Hi fox,

Requested as #72 - minor: Support html content in mailer.php - tt-rss - Tiny Tiny RSS