[exim] Junk host, how to reject some IP's ?

Good morning ,

I have to problems,

1) Having below configuration:
acl_smtp_helo = acl_check_helo
begin acl
acl_check_helo:
verify helo
I would receive only e-mail from host whose HELO could be verified (Am I
correct)?
But I would like to be able to verify HELO's from all host except some host
kept in file.
How to do that ?

2) I would like to reject e-mail from some domains, IP's(would like to have
the list in file),
How and where to do that (acl_smtp_rctp or acl_smtp_connect) ?

Best regards
I would appreciate any help.

Slawomir Orlowski