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After this test is passed, we check for the MX record of port 25 to obtain its IP address.Check the port 25 listening accessibilities and find out if exchange is listening on port 25 or is it some other hosts.
Here we first check if anonymous submission of messages is pliable.
If an exchange verb is obtained as the response to the EHLO command in case of the MX showing an exchange/HUB server.
If the host is not exchange, then the issue might be in the configurations of the smart host.
To prevent a firewall blocking the connection add the machine to the firewall’s IP exclusion settings. Even if the memory device appears to have sufficient free space, data might not be saved if the maximum number of files that can be saved is exceeded.
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Also we can utilise the diagnostic logging at the application event logs to resolve the issue.