[Exim] helo: ip number instead of hostname?

Hi all,

There are some hosts which check HELO addresses, and as my exim
is on a dial-up server, my primary hostname (for my internal use) is
rejected. I suspect that my outgoing interface's IP address would be
good, but I do not know how to pass it to the helo_data option.

Any tips?

exim 3.36.

Thanks,
Ferenc