==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

I like to be on top of things so I tried configuring a firewall myself using firewall-cmd but somehow I feel like what the iRedMail installation has is more elaborate.

What I have running now is:

[root@email vmail]# firewall-cmd --permanent --list-all
public
  target: default
  icmp-block-inversion: no
  interfaces:
  sources:
  services: dhcpv6-client http https imap imaps pop3 pop3s smtp ssh
  ports: 587/tcp xxxxx/tcp
  protocols:
  masquerade: no
  forward-ports:
  sourceports:
  icmp-blocks:
  rich rules:

Is this enough in your opinion or should I forget about trying to do it myself and use what you install?  My knowledge on the subject is limited to what I did so unless it's 1 or 2 small tweaks I wouldn't mind using your settings, if necessary.

Cheers