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On , firstname.lastname@example.org wrote:
>> On , email@example.com wrote:
>> > firstname.lastname@example.org:
>> >> 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[188.8.131.52] 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
>> It doesn't seem to be taking long (from 3rd party location 191 msec)
>> 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
> 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.
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.
delays=0.3/0.01/177/ 0, dsn=4.4.2, status=deferred (lost
connection with mx4.icloud.com.akadns.net[184.108.40.206] while receiving
the initial server greeting)