ISA with Exchange server

I would like to know if it is mandatory to have ISA configured for Exchange server.
I have seen environment , they used RRAS, and configured the SMTP port to be forwarded to SMTP gateway where the email scan is done, from there it gets forwarded to frond end  then to back end.

I believe ASA firewall does the RRAS job too.

I could be wrong.

thanks
jskfanAsked:
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ITF1Connect With a Mentor Commented:
Hello,
there is no simple answer for that question because it depends on your setup and your needs.

Basically ISA is a application Level Firewall with advanced features like Secure Web Publishing (for example OWA via https) ssl Bridging or tunneling and so on.
A typical setup would be using the ISA in front of you network publish OWA allow 80/443 inbound and 25 if you want to receive e-mail by yourself. ISA manages as well Remote Connectivity via VPN RRAS. But you could use ISA as well in a Frontend backend scenario with an exchange EDGE/CAS or 2003 Frontnend  inbetween.

But this is not even half of the available options.
Good sources:
http://www.isaserver.org/
or for the new ISA called TMG
http://blogs.technet.com/b/isablog/
regards
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jskfanAuthor Commented:
Is it mandatory to use ISA server for Exchange or optional
I don't see its utility .
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Suliman Abu KharroubConnect With a Mentor IT Consultant Commented:
No it is not mandatory, but it is more secure to use.
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ITF1Connect With a Mentor Commented:
Optional but requires a seperate licence and a seperate server unles you use a 2003 sbs
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jskfanAuthor Commented:
thanks
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