Milter-greylist

Hi.  I have been using milter-greylist on my sendmail system for about a
month now.  I am glad that the spammers of the world are clueless and
the simple scheme of greylisting works so well.

I do have a question though.  I am puzzled about the timeouts sendmail
is having with sites like yahoo.com, gmail.com and, yes, even hotmail.com.

I have run sendmail 8.13.8, 8.13.7, 8.13.6 and am now trying 8.14.0-beta
and almost all of them have the same issue.  I know this is not a sendmail
list, but the milter-greylist is targetted at sendmail so I am sure there would
be others on this list who might know something.

I am running the stock kernel on my Cobalt Qube (2.2 series) and I am
suspecting that the sendmail timeouts are related to that.  Any suggestions
on what else to check is welcome.

Thanks.

Harish