I am running my postfix (mailcow) in my local network and interface to the outside via a VPN that is terminated on a VPS with a static address with adequate reputation. Historically I used NAT in both directions in- and outbound, but I switched to use proxy protocol inbound as I am in fact now using two VPS in parallel. Outbound I am still stuck with NAT, and thus limited to use IPv4. I looked at several NAT6 variants and also NDP proxy, and all look both complex and discouraged.
Thus I am wondering whether it would be feasible to use proxy protocol outbound as well with postfix. Actually I am doing this with other services and I think it should be straightforward to add. Are you willing to consider that? Or is it already supported and I did overlook an option to use it? I may have overlooked other options. However what I definitely don´t want to do is run a relay server on the VPS. Thanks, Joachim
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