[ILUG] Sendmail problem on outlook

[Saju A P]

I installed sendmail and dovecot on my Fedora core 5 machine. I am
using this is my local mail server. It was worked properly but last
two days it's shows this error message while sending mail. "Relaying
denied. IP name lookup failed [192.168.134.16] Port 25 Secure (SSL)"
so I put the IP of windows machine into /etc/mail/access file now it's
sending but I can't receive the mails through outlook and it's not
showing any error message while receiving. Please help