Greetings all,

I have an issue, I didn't find any information googling regarding can I route my mails based on ip address family. If the address family is ipv6 than deliver emails directly , if it is ipv4 than use the relay or smtp gw. Anyone have this isue.

For the info, this is the scenario:

I have ipv6 only on my disposal, and want to make my mail srever talk with ipv4 servers as well as with ipv6 servers. I can have a relay to my ISP smtp server, which I want to use as rare as possible because I don't want to get listed on SPAM without my fault. If I have to use that server as gw for ipv4 only servers so be it, but I want to be able to deliver mails to ipv6 servers, and dualstack servers, directly without relay. Is it doable with transport_maps options on postfix?

I use postfix 2.10 on CentOS 7, but if anyone sugests anythink else I can change this.

Thank you in advance for the answers.