[Exim] rejected HELO from error

Hi.

When i send a mail from a mailform on one of my servers to my exim
mailserver i get "rejected HELO from freden.infotech-kd.net
[213.180.73.234]: syntactically invalid argument(s): []"

I've googled and found something about underscore i hostnam, but i
don't got any underscore in my hostnames.

please help me

TIA

// Fredrik