My server hosts a site that has to connect on smtp to an outside mail server (Either 587 or 465).
I set up the ports in firewalld:
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[root@60b250e9c256a30001258cd5 public]# firewall-cmd --zone=public --permanent --list-ports 10090-10100/tcp 587/tcp 465/tcp
According to https://portchecker.co/ both ports are closed
When I try to telnet to them from my own PC, the connection fails.
According to the e-mail provider, the issue is on my side....
Any ideas what this can be?