AWS server port 25 blocked after few hours of server creation


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 25
Connected to .
Escape character is '^]'.
n18si6406443jao.103 - gsmtp
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 25

asked 3 years ago39 views
1 Answer
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

answered 3 years ago

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