postfix-users May 2014 archive
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postfix-users: Re: lost connection with ]server] while receiving

Re: lost connection with ]server] while receiving the initial server greeting

From: Wietse Venema <wietse_at_nospam>
Date: Sat May 03 2014 - 00:40:13 GMT
To: Postfix users <postfix-users@postfix.org>

postfix@nisny.com:
> On , wietse@porcupine.org wrote:
> > postfix@nisny.com:
> >> I recently moved out mail operations to a new server. The old server
> >> is
> >> running Postfix 2.8 and the new server 2.10.
> >>
> >> We had some initial problems with some private blacklists and the new
> >> IP but those were resolved. However, I had a curious problem sending
> >> mail to icloud.com addresses. Postfix was reporting:
> >>
> >> lost connection with mx5.icloud.com.akadns.net[17.172.34.68] while
> >> receiving the initial server greeting
> >>
> >> to all MX servers for adadns.net.
> >
> > What is your servers's public IP address? I suspect that PTR
> > or A lookups are taking too long when the remote SMTP server is
> > trying to determine your server's hostname.
> >
> > Wietse
>
> 209.170.151.3
>
> It doesn't seem to be taking long (from 3rd party location 191 msec) and
> wouldn't that have affected as well dong a telnet?

You haven't said if this is a persistent problem. One telnet may
work now, but that does not exclude the possibility of an eralier
problem.

What does Postfix log with "delay=a/b/c/d" when a connection is lost?

Are you going through a stateful firewall/NAT that drops sessions
to soon?

I can speculate until the cows come home, but I prefer not to.

        Wietse