aaPanel_Jose shm This is the 25 port that requires your server to be able to access other servers You can usetelnet smtp.gmail.com 25 to test
aaPanel_Jose shm Communication between mail servers must use port 25. You need to contact your server vendor and ask them to release your server's 25 out port
shm alibabacloud won't unblock port 25, anychance to install mail-server on aliyun? please help thanks
aaPanel_Jose shm You can execute the following command on your server to check if port 25 is blocked again yum install telnet -y && telnet smtp.gmail.com 25