How to resolve dns

[Kinalas]

Hello,

greetings!

current setup:
dc - serv1.company.local, 192.168.0.200
xchange - mail.company.local, 192.168.0.201
dc & xchange are behind a router

router - x.x.x.28
webserver - x.x.x.27

can access my website using www.company.com
can only access xchange using https://mai.company.local/owa from the lan
can only access xchange using http://x.x.x.28/owa from the internet

questions:

how can i resolve so that i access my mail using https://mail.company.com/owa
should this be corrected from my isp dns or my local dns
what should the correct entries be

 

[sk1939]

Are you running a DNS server?

 

[Kinalas]

Yup my dns is installed on the dc machine

 

[sk1939]

You need to make sure that there is a mx-record for mail.company.com, not only on your forward facing DNS, but also for reverse lookup.