AWS server port 25 blocked after few hours of server creation

Question

I am running a EC2 large.t3 instance with CentOs.  
  
My server Region is Ohio.  
  
I have installed WHM and it is working fine.  
  
When I created a server PORT 25 working fine. But after few hours port 25 gets blocked. Due to this I'm not ablw to send any email from my webmails.  
  
Here is the snippet..  
  
Just after server setup:  
  
\[root@ip-172-31-43-92 ~]# telnet   
 aspmx.l.google.com  25  
Trying 172.217.214.26...  
Connected to aspmx.l.google.com .  
Escape character is '^]'.  
220 mx.google.com  ESMTP   
n18si6406443jao.103 - gsmtp  
quit  
221 2.0.0 closing connection   
n18si6406443jao.103 - gsmtp  
Connection closed by foreign host.  
\[root@ip-172-31-43-92 ~]#`  
After few hours and restart:  
  
\[root@ip-172-31-43-92 home]# telnet   
aspmx.l.google.com  25  
Trying 172.217.212.26...

Accepted Answer

Amazon EC2 throttles traffic on port 25 of all EC2 instances by default, but you can request for this throttle to be removed.  
  
This may help you from the AWS website:  
  
Remove The Port 25 Throttle From Your EC2 Instance

AWS server port 25 blocked after few hours of server creation

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