> Hello, if possible configure ipv6 and ipv4 at the same server ?
Yes, anywhere an IPv4 can fit, it can do IPv6. Examples:
smtp-listener [FE80::0202:B3FF:FE1E:8329:25]:25
<domain test.port25.com>
route [2001:db8::1]:26
</domain>
<source fe80::202:b3ff:fe1e:1839>
smtp-service yes
</source>
> Hotmail and Aol does not support ipv6 feedbackLoop??
Please clarify. They are not related. An FBL notification would be sent to an email address.