DNS configuration for zimbra in AD/DS behind a router/fw
I have a problem! My network:
ISP->Router: with 10.22.21.254, DNS:18.104.22.168
->Active directory windows server 2012 r2 / DC: office.domain.com, with 10.22.21.1, DHCP, DNS, IIS Server AND HYPER-V with two distros:
-> UBNTU 12.04. with zimbra set up and running on mail.domain.com on 10.22.21.253; DNS over bind9 showing to 10.22.21.1:
.... (NS Setting) ...
mail.domain.com. IN A IP on what is my IP
domain.com. IN A IP on what is my IP
domain.com. IN MX 10 mail.domain.com.
iface lo inet loopback
# The primary network interface
iface eth0 inet static
-> another windows server 2012 with VPN/DA on vpn.office.domain.com (member of AD) with 10.22.21.252
So my problem:
everything is working quite well, I can resolv mx, dig and host are ok, I can get to zimbra from outside, login through ldap, send a mail, but can not RECEIVE a mail.
DNS on AD/DC (office.domain.com) forward-lookup to mail.domain.com and to office.domain.com, and reverse lookup to mail.domain (10.22.21.253) and DNS OF ISP.
ports 25, 110,143, 7071, 443 are open with routes to mail.domain.com
Did I miss something?
Thanks a lot! I appreciate your help!