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> There is NO NAT or firewall.
> relay=mx4.icloud.com.akadns.net[220.127.116.11]:25, delay=177,
> delays=0.3/0.01/177/0, dsn=4.4.2, status=deferred (lost
> connection with mx4.icloud.com.akadns.net[18.104.22.168] while receiving
> the initial server greeting)
0.3 = No congestion within the Postfix queue.
0.01 = TCP completes immediately.
177 = Postfix waits for the 220 greeting until the connection is dropped.
I suggest that you take Postfix out of the loop, and diagnose this
further with plain old telnet.