How's migadu's email ip reputation? Also do you have to create these identities in that admin panel to use or you can use it on the go like duck.com or Apple's hide my email?
I've been using identities created in the admin panel, but they do have subdomain addresses where everything to *@user.domain goes to user@domain, and you can configure a 'Catchall' address (and of course 'plus addresses'). I haven't used either though.