csf allow not working properly or as expected

[krantikumar55]

we have written rule in csf allow to only allow connection to port 25 from server ip but we are being able to telnet to this port from another ip

rule is written in csf.allow

tcp|in|d=25|s=server ip

tcp|out|d=25|server ip

our intention is only the server should be able to send and receive mails that is we created mail and from cpanel we login into mail and from there only we should be able to send and receive mail but this is not happening as said we were able to telnet port 25 using another ip apart from server ip