On Tue, Dec 09, 2025 at 05:32:24PM +0100, Stphane Guedon wrote: > When looking at the manual to smtpd.conf, on "action" and "relay" nothing > says the relay host has to be ipv4. > > Yet, when writing my conf', it definitely looks like not to be possible to > relay to an ipv6-only host (in my case, I wanted to dedicate a specific ipv6 > address on the relay host).
What exactly is the problem you're having? We have various setups with IPv6 only relay hosts, so it's definitely possible. > Is it possible that the relay function only sends mail to ipv4 addresses ? No, it's not exclusive to IPv4, IPv6 is supported.
