Hi,
Do not know if it is possible, but clearly this one is very powerfull :
https://www.kontaktformular.com/
I use this one as standalone for another domain. And it work very well with php mail()
Maybe you already know.
Adding sql support for pragmamx, multi-services options, admin interface, multi languages support (i can do french translation, already done in fact, but directly in files.) and it would be a nice update 😉.
Yes i guess, a bit work too 🙄...