SMTP smart host authentication fails

[Haines Brown <brownh@hartford-hwp.com>]

This morning, my ISP decided to change the names of their POP and SMTP
servers. For POP, I adjusted the poll in ~/.fetchmailrc and can
receive mail. 

As for SMTP, the new address (smtp.hartford-hwp.com) failed because
there was no IP address for it on the SMTP server. I called back tech
support and was told, Oh, you also need to specify port 587. I tried
that, but still get an error when I try to send a message to
bogggus@msn.com (I'm looking for the DNS server error
message). /var/log/exim4/maillog has:  

2007-10-26 21:07:36 1Ila9I-0001tq-DL 
	<= brownh@teufel.hartford-hwp.com U=brownh P=local S=417
2007-10-26 21:07:36 1Ila9I-0001tq-DL no IP address found for host 
	smtp.hartford-hwp.com
2007-10-26 21:07:36 1Ila9I-0001tq-DL == bogggus@msn.com R=smarthost 
	defer (-1): lookup of host "smtp.hartford-hwp.com" failed in 
	smarthost router

My /etc/exim4/update-exim4.conf.conf has: 

dc_eximconfig_configtype='smarthost'
dc_other_hostnames='hartford-hwp.com'
dc_local_interfaces=''
dc_readhost='hartford-hwp.com'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.hartford-hwp.com::587'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='true'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'

I reconfirmed with tech support that the server address above is
correct. Tehnical support kept asking me if I had enabled
authentication. I can only assume it is.

My mail utility is rmail, and the default mail_spool sents the
incoming mail to ~/RMAIL archive file. 

Is there anything obviously wrong with the exim4 configuration? Except
for the smarthost line, it is what I've been using many months. Could
it be that the server does not like the hostname "teufel" in my
address? I know that I have to edit messages sent to this newsgroup by
removing it from the address on the From: line.
 
-- 
 
       Haines Brown, KB1GRM