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jskfanFlag for Cyprus

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how to specify exchange virtual directory in public DNS

how to specify exchange virtual directory in public DNS
I would like to have internet users type:
owamail.mycompany.com in the address bar of the browser, so that they can connect to exchange via outlook web access.
how do I set up the records in public DNS?

thanks
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can you paste an example of the public DNS records here??
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for instance:

A record for mycompany.com=8.8.10.25
A record for owamail.mycompany.com=9.9.9.9

MX record  @ mycompany.com

if a user sends an email to  john@mycompany.com
then anything after @ is considered as an SMTP port 25 and it will point to 8.8.10.25 and the firewall should allow port 25 and NAT the 8.8.10.25 to Exchange server ip address

and when a user types owamail.mycompany.com it will be redirected to 9.9.9.9 and the firewall will NAT it to exchange FE , assuming we have exchange 2003 only.

this is how I am understanding it.
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thanks