nail set header

Hi all.

I am kind a new in Linux, so please forgive me if some statements will be dumb.
So for some unknown reason server I am working on is using nail command instead of mail and mailx. I have googled around and fined out that it is possible to set mail header using command mail and option -a. But for nail option -a is attaching files. I tried to read nail manual (over 2000 lines), but I haven't found any alternative way to set headder.
If any body knows how to set header using linux mail client - nail, I would be very greatful.

I am using openSUSE 2.6.16.46-0.12-smp x86_64
version of nail: nail 11.25 7/29/05

Thanks in advance
Ricardas