we are going to test install ZCS in a non direct mail delivery environment.
(downloading mails with fetchmail/POP3 stored at different email-accounts
at different ISPs to our main "Zimbra" account/box (e.g. email@example.com) .
For that test env we will get a(1) dyn Ip from DynDNS.org.
My plan is to add NTP and DNS outbound firewall-rules.
Are additional rules required that my internal MX- and A-record are available in DNS?
Thank's a lot for any help.