[Exim] Sender verification via callout

Good day.

I have question about callout.

Some people configure their MTA to discard MAIL FROM:<>
They does not want to know about RFC requirement. I think they are
wrong.
But I need to receive e-mails from such wrong MTA and I do not want to
turn off
Sender verification.

One way I see to do callout from postmaster@??? for example but
not from <>.

Is it posable to configure exim do some thing like I said ? :-)

I don't want to do such things but my chief has said me to do so - e.g.
ask You "How to do wrong"
And if it posable I will configure exim to do so.

Sorry for my question :-).