Force to use ipv6 when sending emails

Hi,

Using mail gateway 8.1.2 both ipv4 and ipv6 defined in network, AAA record points to my ipv6 address and i can reach to interface through ipv6, when sending emails most of the time it uses ipv6 address but in some mails it sends through ipv4, is there any way that i can for pmg to don't use ipv4 and use ipv6 address when sending mails.

I've tried to remove ipv4 address from configuration->interfaces->delete ipv4 and it's gateway, so when i do that i can reach to the admin gui(both fqdn...

Read more