NIC driver question

[Frank Bonnet]

Hello

I will receive in few days my new mail server the machine will
be an IBM X3650 bi xeon.

I wonder what would be the "best" network interface to
plug in (if necessary) as I don't know for now what is
the builtin interfaces in this machine.

To be clear I'm asking gurus on what is the "best FreeBSD supported"
NIC driver to avoid eventual perfomances problems.

Thanks a lot.
-- 
Cordialement
Frank Bonnet