ifconfig output:
sit0: flags=193<UP,RUNNING,NOARP> mtu 1480
inet6 ::127.0.0.1 prefixlen 96 scopeid 0x90<compat,host>
inet6 ::192.168.1.6 prefixlen 96 scopeid 0x80<compat,global>
inet6 ::192.168.0.244 prefixlen 96 scopeid 0x80<compat,global>
sit txqueuelen 1000 (IPv6-in-IPv4)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
sit1: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1480
inet6 2001:470:6840::2 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::1 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:6840::9 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:6840::6 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:6840::10 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::4 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:1f09:7e::9 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:6840::1 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:6840::8 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:6840::5 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::7 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:1f09:7e::8 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:1f09:7e::3 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:1f08:7e::2 prefixlen 64 scopeid 0x0<global>
inet6 fe80::c0a8:106 prefixlen 64 scopeid 0x20<link>
inet6 2001:470:6840::4 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::10 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:6840::3 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::6 prefixlen 64 scopeid 0x0<global>
inet6 fe80::c0a8:f4 prefixlen 64 scopeid 0x20<link>
inet6 2001:470:6840::7 prefixlen 48 scopeid 0x0<global>
inet6 2001:470:1f09:7e::2 prefixlen 64 scopeid 0x0<global>
inet6 2001:470:1f09:7e::5 prefixlen 64 scopeid 0x0<global>
sit txqueuelen 1000 (IPv6-in-IPv4)
RX packets 878 bytes 77840 (76.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3186 bytes 286878 (280.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
/etc/postfix/main.cf:
inet_protocols = ipv6
inet_interfaces = all
smtpd_banner = $myhostname ESMTP $mail_name (Debian)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = born2host.com
alias_maps = hash:/etc/aliases,hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases
mydomain = born2host.com
myorigin = mail.born2host.com
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
relayhost =
mynetworks = 127.0.0.0/8 192.168.0.244/28 192.168.1.6/28 [2001:470:1f09:7e::8]/64 [2001:470:6840::8]/48 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
relay_domains = born2host.com, mail.born2host.com, srv.born2host.com, mx.born2host.com, lists.born2host.com,
I skipped some lines from main.cf as they are default by installation. As I`m using NowTV (UK) as an internet provider I think that their router is blocking me. But the server is DMZ + I added firewall rules in the router to accept any requests on port 25. As they provide me with IPv6 the router can`t be configured with the tunnel. I think this is the problem with the Now TV Hub Two.