Sendmail problem

[cliff at cliffmeyers.com]

Hi Everyone,


I've been running the default RedHat 8.0 sendmail install (sendmail-8.12.5-7.rpm)
on my webserver for the purposes of relaying e-mails generated by my PHP apps. 
It had been running fine until a few days ago, when I noticed that the e-mails
weren't being send anymore.

I looked at my maillog files and it looks like here's where it started to fail...
all the entries to the maillog files since this point have been refused it would
seem:

Aug 17 06:00:28 titanium sendmail[7534]: h7HA01Oo007534: from=root, size=4023,
class=0, nrcpts=1, msgid=<200308171000.h7HA01Oo007534
@titanium.quinlanco.net>, relay=root at localhost

Aug 17 06:00:28 titanium sendmail[7542]: h7HA0SWu007542:
from=<root at titanium.quinlanco.net>, size=4315, class=0, nrcpts=1, msgid=<20
0308171000.h7HA01Oo007534 at titanium.quinlanco.net>, proto=ESMTP, daemon=MTA,
relay=titanium.quinlanco.net [127.0.0.1]

Aug 17 06:00:28 titanium sendmail[7534]: h7HA01Oo007534: to=root, ctladdr=root
(0/0), delay=00:00:27, xdelay=00:00:00, mailer=relay,
 pri=30221, relay=titanium.quinlanco.net. [127.0.0.1], dsn=2.0.0, stat=Sent
(h7HA0SWu007542 Message accepted for delivery)

Aug 17 06:00:28 titanium sendmail[7543]: h7HA0SWu007542:
to=<root at titanium.quinlanco.net>, ctladdr=<root at titanium.quinlanco.net> (0/
0), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=34552, dsn=2.0.0, stat=Sent

Aug 18 01:03:10 titanium sendmail[7790]: h7I5000U007790: from=root, size=7935,
class=0, nrcpts=1, msgid=<200308180500.h7I5000U007790
@titanium.quinlanco.net>, relay=root at localhost

Aug 18 01:03:10 titanium sendmail[7790]: h7I5000U007790: to=root, ctladdr=root
(0/0), delay=00:03:10, xdelay=00:00:00, mailer=relay,
 pri=30214, relay=titanium.quinlanco.net. [66.202.79.100], dsn=4.0.0,
stat=Deferred: Connection refused by titanium.quinlanco.net.


Can anyone offer advice here?  Admittedly I don't know much about sendmail, but
this is kind of a major problem.  Any advice would really be appreciated - thanks
so much.


-Cliff