[ic] Strange "Unable to send mail" error

[David Bordas]

 > That sounds EXACTLY like the probem I had a few weeks back. The problem 
> in my case was with my DNS. The first machine listed in my 
> /ets/resolv.conf was down for service. That caused sendmail to timeout 
> before the DNS lookup could be performed for maybe 1 in 10 of my orders. 
> Like you, I had to get the order info from the catalog's error.log. No 
> errors showed up in /var/log/messages or /var/log/maillog.
> 
> Try some command line experiments using nslookup or dig to test the 
> responsiveness of the first server listed in your /etc/resolv.conf, or 
> try a putting different server first in the list. I strongly suspect 
> your problem is related to DNS.
> 

Thanks, i'll look to that.
David