Question : Configure sendmail to not check for PTR

Can someone point in the right direction to configure Sendmail 9.3, running on Slackware 10.1, to NOT check for the existance of a PTR record on the senders ip address? I realize this goes against the grain but one of our customers is having problems getting reverse DNS on his connections and has a wide range of dynamic ip's to simpy try to allow by ip address.

Thanks in advance for any assistance you can offer.

Regards

Greg

Answer : Configure sendmail to not check for PTR

See --> http://www.sendmail.org/m4/anti_spam.html

Specifically, you want -->  FEATURE(`accept_unresolvable_domains')

If this is happening for just a few hosts, it would be better to use an access map with the "Connect:" keyword as described a bit further down on that web page.