How to open port 465 on CentOS 7 server?

Question

linux

Good afternoon, there is Bitrix, the problem is in inviting employees, sending from the mail does not work, they say to open port 465, I wrote the rules for iptables, but the port is still closed, I checked it with telnet.
BitrixVM is installed on the server.
Tell me how to do it right?

Answer 1

1. Bitirx VM uses msmtpd by default and does not send mail directly, using an external service to send mail.
2. if you have a local mail service, then you need to open the port, but in different versions of vm it can be different depending on the version of vm and centos

iptables -I INPUT -p tcp --dport 465 -m state --state NEW -j ACCEPT
service iptables save
/etc/init.d/iptables restart

or so
For CentOS7

firewall-cmd --zone=public --add-port=465 /tcp   --permanent
service iptables save

iptables -I INPUT -p tcp --dport 465 -j ACCEPT
service iptables save

Answer 2

Telnet will show you something if you have your own mail server deployed.
If an external server is used, you need to check telnet to an external server.