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: <postfix_at_nospam>
Date: Sat May 03 2014 - 01:13:53 GMT
To: postfix-users@postfix.org

On , wietse@porcupine.org wrote:
> 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

Sorry, I'm not trying to be difficult but I don't know what your
speculation might run and therefore what questions you'll have.

There is NO NAT or firewall.

relay=mx4.icloud.com.akadns.net[17.172.34.67]:25, delay=177,
delays=0.3/0.01/177/ 0, dsn=4.4.2, status=deferred (lost
connection with mx4.icloud.com.akadns.net[17.172.34.67] while receiving
the initial server greeting)