[Pkg-exim4-users] Exim4 saying network unreachable. Why, nothings changed

[Nate Homier]

Error;

2016-11-06 07:36:04 1c3OXG-0005zy-2n H=gmail-smtp-in.l.google.com 
[2607:f8b0:400e:c05::1a] Network is unreachable


Then;

2016-11-06 07:36:05 1c3OXG-0005zy-2n => *@gmail.com R=dnslookup 
T=remote_smtp H=gmail-smtp-in.l.google.com [173.194.203.26] 
X=TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256 CV=yes 
DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" 
C="250 2.0.0 OK 1478442965 yi4si22465348pac.256 - gsmtp"


Sorta looks like an IPv6 address is failing.  I'm confused as I have 
never seen this error before.  I am on a IPv4 network.  Did Exim4 start 
doings things differently?  I tried telnetting into a remote host on 
port 25 and it worked.  So I have port 25 access to the world outside.  
So far my server can send emails.  It won't receive emails by design due 
to mx settings.


dc_eximconfig_configtype='internet'
dc_other_hostnames='frontier'
dc_local_interfaces='127.0.0.1 ; ::1'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost=''
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname=''
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool'

nate at frontier:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.10
Release:	16.10
Codename:	yakkety

nate at frontier:~$ uname -a
Linux frontier 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 
2016 x86_64 x86_64 x86_64 GNU/Linux

It's probably harmless.

Nate.