[CentOS] Missing something about sendmail

Hi All,

I have a strange problem that I don't understand. I have an access file 
which has the following line:

168.144.250.215                 OK # xsmtp02.mail2web.com

Yet email from this IP address is getting rejected. From my log file

Oct 15 21:52:33 mx01 sendmail[10569]: ruleset=check_relay, 
arg1=xsmtp02.mail2web.com, arg2=168.144.250.215, 
relay=xsmtp02.mail2web.com [168.144.250.215], reject=553 5.3.0 OK # 
xsmtp02.mail2web.com

Is this because I have commented out

dnl FEATURE(delay_checks)dnl

in my sendmail.mc?

What is the ruleset check_relay actually doing in this case. I have seen 
other cases where it rejected a message but always with a useful 
message. why is there a reject=553 code but with an OK after it? Can 
somebody give me a clue as to what I have misconfigured.

-- 
Paul (ganci at nurdog.com)