Experimenting with trying to set up an email server for perhaps 6-8 users and following RHEL 8 Documentation. I've NOT yet forwarded ports from 'the outside' - and that may be a while, or never at all! That said, I run across these instructions:
However, 'submission' is listed in /etc/services (as 'msa') but I getConfigure the firewall for sending and receiving emails using the following steps:
To add the service
# firewall-cmd --permanent --add-service=servicename
Replace the servicename with any of the services in the /etc/services. For example, smtp, submission.
Reload the service for the change to take effect
# systemctl reload firewalld
Ideas/hints/tips?Error: INVALID_SERVICE: 'submission' not among existing services