Gmail doesn't allow SMTP connections via IPv6
phunehehe.net
phunehehe.net
$ nmap -6 -Pn 2404:6800:4003:c02::6c
Starting Nmap 7.10 ( https://nmap.org ) at 2016-03-27 17:38 PDT
Nmap scan report for sc-in-x6c.1e100.net (2404:6800:4003:c02::6c)
Host is up (0.18s latency).
Not shown: 996 filtered ports
PORT STATE SERVICE
465/tcp open smtps
587/tcp open submission
993/tcp open imaps
995/tcp open pop3s
Nmap done: 1 IP address (1 host up) scanned in 13.51 seconds
$ nmap -Pn 74.125.68.108
Starting Nmap 7.10 ( https://nmap.org ) at 2016-03-27 17:38 PDT
Nmap scan report for sc-in-f108.1e100.net (74.125.68.108)
Host is up (0.19s latency).
Not shown: 996 filtered ports
PORT STATE SERVICE
465/tcp open smtps
587/tcp open submission
993/tcp open imaps
995/tcp open pop3s
Nmap done: 1 IP address (1 host up) scanned in 12.86 seconds $ mtr --report-wide 2404:6800:4003:c02::6c --tcp --port 993
Start: Mon Mar 28 03:23:08 2016
HOST: phunehehe-do3 Loss% Snt Last Avg Best Wrst StDev
1.|-- 2400:6180:0:d0:ffff:ffff:ffff:fff1 0.0% 10 0.7 1.1 0.3 6.5 1.9
2.|-- 2400:6180::601 0.0% 10 0.3 0.3 0.3 0.4 0.0
3.|-- 2400:6180::301 0.0% 10 0.9 0.6 0.3 1.3 0.0
4.|-- 2001:4860:1:1:2:82d:: 0.0% 10 0.9 1.8 0.9 3.8 0.7
5.|-- 2001:4860::1:0:518d 0.0% 10 1.7 2.0 1.7 2.2 0.0
6.|-- 2001:4860::2:0:ab29 0.0% 10 2.2 9.5 1.8 64.4 19.6
7.|-- 2001:4860::2:0:ab28 40.0% 10 2.7 2.4 1.7 3.3 0.4
8.|-- sc-in-x6c.1e100.net 70.0% 10 127.0 151.6 126.9 200.8 42.6
$ mtr --report-wide 2404:6800:4003:c02::6c --tcp --port 465
Start: Mon Mar 28 03:23:30 2016
HOST: phunehehe-do3 Loss% Snt Last Avg Best Wrst StDev