sendmail hangs at user open
===

I've updated some stuff on my system, and sendmail stopped working.

One symptom I notice though is that sendmail seems to be hanging.  Here's a a line from ps.

[code]
root     28591 20215  0 04:46 ?        00:00:00 sendmail: ./q6PBJKPB026081 mx1.hotmail.com.: user open
[/code]

These just sit there until I restart sendmail.  Mails never sent.  

I have my domain name, localhost name, etc. set in /etc/hosts.  Also have localhost.localdomain set to 127.0.0.1.  The nameservers appear to be working just fine as I can scrape other webpages.

Kind of at a loss here.  I've seen a few topics about sendmail.cf but not getting much of anywhere.  sendmail.cf is rather complex.  This is on CentOS.