Milter-greylist

I added this to greylist.conf:

from /.*@usaa\.com/

I restarted milter-greylist to be sure.

Then I noticed these in my maillog:

Apr 21 10:13:34 wintermute milter-greylist: j3LFDYUs025713: addr 
167.24.99.202 from <USAA.CUSTOMER.SERVICE@...> to 
<THOMAS.CAMERON@...> delayed for 00:00:44

Apr 21 10:13:34 wintermute sendmail[25713]: j3LFDYUs025713: Milter: 
to=<THOMAS.CAMERON@...>, reject=451 4.7.1 Greylisting in action, 
please come back in 00:00:44

Apr 21 10:13:34 wintermute sendmail[25713]: j3LFDYUs025713: 
from=<USAA.CUSTOMER.SERVICE@...>, size=43922, class=0, 
nrcpts=0, bodytype=8BITMIME, proto=ESMTP, daemon=MTA, 
relay=oak2-int.usaa.com [167.24.99.202]

So is whitelisting case sensitive or am I not understanding how it works?

Thomas