How do I remove site name from emails?

I edited Bp better messages notification email in buddypress email settings by removing the site name. But it seems Bp better messages keeps creating another template with the site name included.

I don’t want the site name to show in email. This is because users can see that the message is coming from my domain so I don’t think including the site name in bracket [] is necessary.

How do I get ride of [site.name] completely in Bp better messages notifications?