Subject in mail (But with styles)

Hello,

The plugin works perfectly well, but I’m trying to make the subject-in-mail- work when it has a style attached to it,

I have added a link that shows what I am talking about, when the subject-in-mail has h1 tags around it (like in the link), Postie does not recognise it as a subject, is there something I could do?

Link to image: https://thebts.group/nc_assets/Screenshot%202021-07-28%20151248.png

Kind regards,
F.

The page I need help with: [log in to see the link]