I have setup my laptop (as a test) to send out and respond to ipv6 mail, and not listen on the ipv4 ports at all. I tunnel my laptop out to have a static ipv6 address, and have mx records (for the teklibre.org domain) that have a priority 10 for the ipv6 "direct" connection, and a priority 20 mx record for a dual ipv4, ipv6 machine acting as a smart relay. This seems to be working with all the mail exchangers I've tried thus far.
I'd like to (assuming I get reverse dns straightened out) convince postfix to: If possible, send out the email from my static ipv6 address to any ipv6 capable mail exchanger (for example, I correspond with someone at isc.org, and their mail exchanger, mx.isc.org sits on both ipv4 and ipv6), and if that is not possible, fall back to my better connected relay host. Right now, everything not in mynetworks gets forwarded to my ipv6 relay host which has both ipv4 and ipv6 addresses because I have relayhost set.... ? -- Dave Taht http://the-edge.blogspot.com
