bbpress notification emails don’t use HTML format

Hello !

Thank you for this plugin and the routing feature that is an awesome idea I was needing.

I previously used Post SMTP plugin with mailgun that allowed me to send html formatted emails to my bbpress users.
With FluentSMTP, sent emails lose the html format and are not readable by user (they are sent in “plain text” mode).

I didn’t find where to specify that I want to use HTML for the MailGun connexion. Would it be possible to add a “Send HTML” option to the MailGun (and other providers) configuration page ?

thank you for your help,
Best regards