[IMail Forum] What to whitelist from a Header

[Travis Rabe]

When I look at the headers of an email and I see three different lines that say “Received From”, which one do I whitelist?  I am thinking it is the one nearest the top of the header.  Also, do I have to put in the entire server name or can I just put I part of it?  For example, if I wanted to whitelist Yahoo Groups to come on in, then I see where I might have to put in “n32.grp.scd.yahoo.com” to make this happen for a particular e-mail that got caught in the anti-spam filters.  But yesterday and the day before that it came from a different server, but both belonged to “ *.grp.scd.yahoo.com”.  Can I just whitelist “grp.scd.yahoo.com” or do I have to manually wait and add a new server when it comes along?   Thanks,   Travis