Capitalize the Email Headers

Andrew's original comment:

Also, I found that From and Reply-to headers do not work, because of you use lowercase in $headers array (see EmailApi.php:getHeaders() function). You need to update this code to

$headers = [
      'Content-Type' => 'text/plain; charset=UTF-8;',
      'MIME-Version' => '1.0',
      'Reply-to' => $replyTo,
      'From' => $this->siteConfig->get('name') . ' <' . $from . '>',
    ];

Note: I used Reply-To instead of Reply-to.

Reading https://www.rfc-editor.org/rfc/rfc5322.html, I can't tell if the headers are required to be uppercase or lowercase.

It mentioned that "A" could mean upper or lowercase A and "Reply-To" is always mentioned in quotes.

Don't know, but uppercased the headers just in case.

Automatically closed - issue fixed for 2 weeks with no activity.