jzobeidi hello I want to install mail server on Centos 7 but I can port 25 is already opened in firewall but aapanel mail server can't detect it image 2 from puty how can i fixed it
aaPanel_Jose jzobeidi What he means is that your server needs to have access to port 25 of other servers you can use this command to check yum install telnet -y telnet smtp.gmail.com 25 This is the correct return value this is the right resule
