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On , email@example.com wrote:
>> I recently moved out mail operations to a new server. The old server
>> running Postfix 2.8 and the new server 2.10.
>> We had some initial problems with some private blacklists and the new
>> but those were resolved. However, I had a curious problem sending
>> to icloud.com addresses. Postfix was reporting:
>> lost connection with mx5.icloud.com.akadns.net[18.104.22.168] 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.
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?