I install new server and new SmarterMail (version 16, previous was 15.6) and again I have the same problem as the old one.

Each outbound email fail because this:

"Failed to connect to the recipients mail server. No MX records were found for the 'gmail.com' domain. Failing over to A records."

This is example for gmail.com but even I pointed on Google DNS I'v got the same error.

What's going on ?????

 

This part is over and over again for each outbound emails.

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21:18:28 [76001] Failed to connect to the recipients mail server. No MX records were found for the 'gmail.com' domain. Failing over to A records.
21:18:28 [76001] Initiating connection to 172.217.18.165
21:18:28 [76001] Connecting to 172.217.18.165:25 (Id: 1)
21:18:28 [76001] Binding to local IP 62.138.3.178:0 (Id: 1)
21:18:49 [76001] Exception connecting to 172.217.18.165 (Id: 1)
21:18:49 [76001] System.Net.Sockets.SocketException (0x80004005): An attempt was made to access a socket in a way forbidden by its access permissions 172.217.18.165:25
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Connect(EndPoint remoteEP)
   at RelayServer.Clients.SMTP.ClientConnectionSync.Connect(Int32 connectionId)