Re: Mailer configuration - IPv6 only

[Dave Huang <khym%azeotrope.org@localhost>]

On 12/17/2015 20:10, paul%whooppee.com@localhost wrote:
> However, for some reason, all email is still being delivered to the
> backup machine, even when being delivered via IPv6.  According to
> /var/log/maillog on the desired machine, there aren't even any
> connection attempts.  (The only mail being delivered to the desired
> machine is locally-originated mail.)

The problem seems to be at a lower level than SMTP. pokey.whooppee.com 
doesn't seem to be reachable via IPv6--or at least ping6, traceroute6, 
and most importantly, TCP connections to port 25 don't work:

$ ping6 pokey.whooppee.com
PING pokey.whooppee.com(pokey.whooppee.com) 56 data bytes
^C
--- pokey.whooppee.com ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 2999ms

$ traceroute6 pokey.whooppee.com
traceroute to pokey.whooppee.com (2605:2700:1:1043::2), 30 hops max, 80 
byte packets
 1  2600:3c00::8678:acff:fe5a:b41 (2600:3c00::8678:acff:fe5a:b41) 1.130 
ms  1.114 ms  1.154 ms
 2  2.00.0000.ip4.static.sl-reverse.com (2607:f0d0:2:4::2:2)  0.261 ms  
0.264 ms  0.248 ms
 3  0.00.0000.ip4.static.sl-reverse.com (2607:f0d0:2:4::1:e)  1.225 ms  
1.350 ms  1.423 ms
 4  2.00.0000.ip4.static.sl-reverse.com (2607:f0d0:2:4::1:2)  0.861 ms  
0.961 ms  0.995 ms
 5 e600.0000.0000.0000.2000.2000.0d0f.7062.ip6.static.sl-reverse.com 
(2607:f0d0:2:2::6e)  0.471 ms  0.477 ms  0.461 ms
 6  ae7.bbr02.eq01.dal03.networklayer.com (2607:f0d0:2:2::4d)  0.588 
ms  0.558 ms  0.537 ms
 7  po2.bbr02.tl01.atl01.networklayer.com (2607:f0d0:2:2::7)  22.836 
ms  19.803 ms  22.490 ms
 8  2001:478:132::75 (2001:478:132::75)  20.955 ms  20.940 ms 20.894 ms
 9  100ge12-1.core1.dal1.he.net (2001:470:0:35f::1)  21.876 ms 21.869 
ms  23.325 ms
10  100ge4-2.core1.phx2.he.net (2001:470:0:360::2)  49.488 ms 49.654 ms  
49.490 ms
11  100ge11-2.core1.lax2.he.net (2001:470:0:362::1)  118.250 ms 117.993 
ms  118.025 ms
12  100ge2-1.core1.lax1.he.net (2001:470:0:72::1)  55.396 ms 
10ge9-5.core1.sjc2.he.net (2001:470:0:16a::1)  60.448 ms 
100ge2-1.core1.lax1.he.net (2001:470:0:72::1)  55.342 ms
13  100ge15-1.core1.sjc2.he.net (2001:470:0:2b7::1)  68.847 ms 68.989 
ms  68.822 ms
14  10ge4-4.core1.sjc1.he.net (2001:470:0:55::1)  68.356 ms  68.284 ms 
prgmr-com-inc.10gigabitethernet1-1-20.switch1.sjc1.he.net 
(2001:470:1:1c8::2)  60.741 ms
15  vps1.whooppee.com (2605:2700:0:2::4713:9012)  58.698 ms  59.568 ms 
prgmr-com-inc.10gigabitethernet1-1-20.switch1.sjc1.he.net 
(2001:470:1:1c8::2)  61.908 ms
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  *^C

$ telnet pokey.whooppee.com 25
Trying 2605:2700:1:1043::2...
telnet: Unable to connect to remote host: Connection timed out

So, I think the first thing to do is get connectivity to that address 
working... firewall issue, perhaps?