[exim] disabling sender verification

Hello everyone.

I've got a mailing list (mailman) set up on a box using exim, and I'm
trying to have my cvs send it mail from a dhcp'd network. Anyway, the
address it's sending from is non-existant. (dummy@???)

I first tried adding

require verify = sender
accept domains = +local_domains : my.com
endpass

which failed.

then I tried commenting out the whole deal

#require verify = sender
#accept domains = +local_domains
#endpass

and I still get a "550 Administrative prohibition"

I'm sorry. I'm a newb to exim. Any advice greatly apreciated. I
tried to rtfm, but admit my reading comprehension on this one was way
down.

Thanks for any help :)

-- James