WordPress.org

Can I add html to the message?

No, this version is using the default wordpress function which only sends text emails.

Fatal Error after upgrade

Sorry, this issue has been fixed but if you have an older version please disable the plugin before upgrading. If you have already tried to upgrade and get this error you will need to edit one of the files.

Go to plugin - editor and from the upper dropdown select comment-emailer then edit the top file comment-emailer/comment-emailer.php

Line 22 says include 'notify_postauthor.php'; please comment this line out activate the plugin then disable the plugin. Once you have diasabled the plugin you can uncomment this line and then reenable the plugin.