Jack Raats:
> Wietse,
>
> I run the script every five minutes for more than 13 hours to the DNS
> server of Cloudflare (2620:fe::fe).
> Four times I had some packet drops (about 25%).
Was that network path in any way similar to the path to your MX
checker? You can check that with mtr (or traceroute which is much
less informative)
> I think that cann't explain why postfix is not reachable on ipv6.
I think you have proven that some MX checker over some unknown path
cannot always reach your Postfix system. I routinely run ping and
mtr to monitor my connectivity. If there is packet loss, them mtr
will tell me where on the network path that happens.
> Can postscreen drop an ipv6 connection?
Postfix does not care if a connection is over IPv4 or IPv6. Really.
If there is a difference, then that happens at a lower level in the
stack. It just happens to be more visible at the application level.
Don not shoot the messenger of the bad news.
Wietse
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