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Maillog shows error './Remote_host_said:_450_4.7.1_Client_host_rejected:_cannot_find_your_reverse_hostname'.
This error occurs when reverse dns of MCS server is not properly set.
Reverse dns can be verified using following command
host -a ip-address of server
Example :- host -a 184.108.40.206
If output is similar to as shown below , it means that reverse dns is not set properly.
Host 220.127.116.11.in-addr.arpa not found: 2(SERVFAIL)
Received 46 bytes from 18.104.22.168.#53 in 302 ms