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You don't to set external URLs if the server is not internet facing.<br />
You should keep it blank.
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You don't to set external URLs if the server is not internet facing.
You should keep it blank.

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how about internal URL ? can i use same URL that use at internet facing site ?
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how about internal URL ? can i use same URL that use at internet facing site ?

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Yes you can use the same as external URL of internet facing server
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Yes you can use the same as external URL of internet facing server

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HI guys, <br />
<br />
I have one question regarding exchange 2013 internet facing and non-internet facing site. We are using single namespace for both sites. <br />
<br />
Should i remove the External URL from the Virtual Directories at non-internet facing site ?<br />
<br />
Regards
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HI guys, 

I have one question regarding exchange 2013 internet facing and non-internet facing site. We are using single namespace for both sites. 

Should i remove the External URL from the Virtual Directories at non-internet facing site ?

Regards

Exchange 2013 - non Internet facing site

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Internet / Email Software

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.