How to send mail over IPv6

sonic

Hi,
I have noob question related IPv6 and sending mail.

I have 2 VPS, 1 with Ramnode and one with Linode

1. VPS with Ramnode
   I configure Nginx webserver listen on IPv6 only (Ramnode give me 16 IPv6)
   Webserver running fine
   When i send mail (use php mail function), mail header dislay ipv6

2. I configure Nginx webserver listen on IPv6 only (Linode gives me this IP 2400:8900::f03c:91ff:fe6e:f934/64)
   Webserver running fine on 2400:8900::f03c:91ff:fe6e:f934
   When i send mail (use php mail function), mail header dislay IPv4

So my question is, how to configure network interface to dislay IPv6 in header when sending mail with Linode VPS?

sonic

Linode VPS /etc/network/interfaces

The loopback network interface

auto lo
iface lo inet loopback

The primary network interface

auto eth0
iface eth0 inet dhcp

sonic

Anyone help plz

wych

Might be able to find some info on:

http://engineering.linkedin.com/email/sending-and-receiving-emails-over-ipv6

udk

Are you sure the mail server you are sending to supports IPv6?

Is your OS using IPv6 by default? Check /etc/gai.conf

active8

Try this check for ipv6
https://www.mythic-beasts.com/ipv6/health-check
All should be green

sonic

@udk said:
Are you sure the mail server you are sending to supports IPv6?

Is your OS using IPv6 by default? Check /etc/gai.conf

Both ramnode and linode support native IPv6. And both of them gives free IPv6 to client.
But they have different configuration so that i have to find out