Q: DNS Services Yosemite Server 4.1.3

Dear All,

Im really lost, i have set up the DNS on the server side with the following options

Primary Zone : domainname.com

boeing.domainname.com  - machine record pointing to mail local IP address  (Machine name is boeing)

boeing.domainname.com  NS record

mail.domainname.com  MX record

Reverse is pointing to internal Network main boeing.domainname.com

NOTE Boeing is the machine name (Running Yosemite 10.10.4 and server 4.1.3 (Build 14S1127)

Now i have running  MAIL, Calander, VPN, WEBSITES,Wiki, Open directory . All except mail work externaly, but not internaly and mail can send outside.  I do recieve mail strangly.

In reachability on the server I see Calander, DNS, SSH. Screensharing, Web Admin, Website and Wiki that they are seen externaly by Apple. My public hostname is also boeing.domainname.com, it shows this. But no Mail

The external IP address is supplyed via static IP from the Provider that goes to the Fritz box router, that serves the DHCP internaly. But it has one DMX rule to 192.168.178.2  (This is the internal MAC OSX server)  the DNS lookups are forwarded to the Fritzbox and the external provider's DNS

Any help or anybody that can save the day? I know im a noob but my family depends on the NOOB   Im just lost in what im doing wrong.

Cheers

Mke