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I am using 2 servers (A and B) centos 7. I am trying to telnet from A to mail.smtp2go.com

serverA$ telnet mail.smtp2go.com 2525
Trying 45.33.53.153...
telnet: connect to address 45.33.53.153: Connection refused
Trying 66.228.43.14...
telnet: connect to address 66.228.43.14: Connection refused
Trying 45.79.71.155...
telnet: connect to address 45.79.71.155: Connection refused
Trying 173.255.233.87...
telnet: connect to address 173.255.233.87: Connection refused 

which fails and hence i cannot use port 2525 for mail transport. Server A can telnet through 25 port

serverA$ telnet mail.smtp2go.com 25 
Trying 45.33.53.153...
Connected to mail.smtp2go.com.

So i am currently using it.

But it makes me crazy when Server B (on same subnet as of Server A) can telnet on port 2525 and 25 both successfully. What could be matter with A ?

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