[exim] Exim-4.69 weird hang problem

This my first use of exim, so bear with me.

I'm routing all messages (including locals) through their
respective MX servers with the following conf file.

The problem is mail command hangs. When issuing:

    net1#exim -bt david@???
    david@???
    router = dnslookup, transport = remote_smtp
    host net1.coolsurf.com [69.94.137.124] MX=10
    host net2.coolsurf.com [69.94.137.128] MX=20

This is correct.

The following appears to complete correctly, then hangs forever,
never completing and coming back to the shell prompt.

Two questions:

    1) Is the local_interfaces = '' trick the best way to avoid
       "lowest numbered MX record points to local host" errors

    2) How to have the mail command (SMTP session) really complete
       and come back to the shell prompt

Thanks.

________

net1#echo foo | mail -v -s foo david@???
Loading lookup modules from /usr/lib/exim/4.69-5.fc8/lookups
Loaded 0 lookup modules
LOG: MAIN
   <= root@??? U=root P=local S=333
Loading lookup modules from /usr/lib/exim/4.69-5.fc8/lookups
Loaded 0 lookup modules
delivering 1K2UhF-0006sz-Gn
Connecting to net1.coolsurf.com [69.94.137.124]:25 ... connected
net1#  SMTP<< 220 net1.coolsurf.com ESMTP qpsmtpd 0.43rc1
   SMTP>> EHLO coolsurf.com
   SMTP<< 250-net1.coolsurf.com Hi net1.coolsurf.com [69.94.137.124]
          250-PIPELINING
          250 8BITMIME
   SMTP>> MAIL FROM:<root@???>
   SMTP>> RCPT TO:<david@???>
   SMTP>> DATA
   SMTP<< 250 <root@???>, sender OK
   SMTP<< 250 <david@???>, recipient ok
   SMTP<< 354 go ahead
   SMTP>> writing message and terminating "."
   SMTP<< 250 Queued
   SMTP>> QUIT
LOG: MAIN
   => david@??? R=dnslookup T=remote_smtp H=net1.coolsurf.com [69.94.137.124]
LOG: MAIN
   Completed

_______

primary_hostname  = coolsurf.com
qualify_domain    = coolsurf.com
qualify_recipient = coolsurf.com

domainlist local_domains =
domainlist relay_to_domains =
hostlist relay_from_hosts = 127.0.0.1 : 192.168.0.0/16

# seemingly only way to avoid "lowest numbered MX record points to local host"
local_interfaces =

### never_users = root

freeze_tell = postmaster
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d

### split_spool_directory = true

# order matters, process till address accepted
begin routers

# all messages go to their MX defined server
dnslookup:
   driver    = dnslookup
   transport = remote_smtp

# one transport called per router
begin transports

remote_smtp:
driver = smtpbegin retry

# Address or Domain    Error       Retries
# -----------------    -----       -------
*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h

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