whitelist

Grrr, places that I and my users do business on (ebay/half.com) do not put
message-ids into the mailmessage (thanks to qmail). I am wondering if it 
was possible to keep the message-id check and whitelist ebay.com/half.com

example:

many   message-id <>
ok	from	half.com
ok	from	ebay.com



Second question, is it possible to whitelist just the domain. Examples and 
man pages suggest that it is a RFC2882 address (user@domain.tld).