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I will be setting up a SMTP GAteway server on the DMZ, can i use a different port

I am going to setup a smtp gateway server on our DMS, should i use a different port to forward the mail inside?  Is that possible? i know sometimes we change port numbers on services to mask what they are and add more security.  I will be using windows 2003 server for the smtp gateway and a windows 2000 server running exchange 2000 as the smart host.

thanks.  this is the first time i will have done this.  We use to just use a 1 to 1 NAT through the firewall and open up SMTP to the server.

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YankeeFan03
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YankeeFan03
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Yan_westCommented:
Yes it is possible, For Exchange 2000\2003, change it in the General Tab of the SMTP Virtual Server. it will ask you for the port you want to use..
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YankeeFan03Author Commented:
how do i change it on a Windows 2003 server being used as the SMTP Gateway?  I think i have to set the Gateway to forward the email on the same port i change the other one to.  Is that correct?
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Yan_westCommented:
Yes.. that's it. you have to foward your mail to the port that was changed on the other server. Just have to put port X on the smtp service on the gateway..
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YankeeFan03Author Commented:
thanks Yan west you have been right on.  I see in the IIS manager i can go to the properties of the "default smtp virtual server" and then click the advanced button to change a port.  But, will this affect what port he listens on for incoming email or is that the port that he will use to push the messages to his smart host?  Want to make sure i don't change the wrong thing.  

thanks.
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Yan_westCommented:
Check in the help for the advanced tab where you can change it.. I'm not sure, I knew it could be done, but I've never done it personnaly.
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YankeeFan03Author Commented:
i am going to keep the port 25 for SMTP.  I have another question.  

So i have my SMTP gateway server on the DMZ, with a rule that allows 25 traffic in to the DMZ.  I then have the SMTP server pointing to a smart host on the inside network which is my exchange server.  I only have one NIC.  I am going to assign that NIC a public DMZ address and set the gateway to the firewall.  I will then setup another rule allowing the traffic in from the firewall DMZ to the lan.  Will the firewall be able to route the smtp traffice back into the LAN?  it is a sonicwall 3060.  Or do i need to set the server with 2 NICS?  How does that work?  Two NICS does not make sense to me.  I am assuing the firewall can route the traffic back into the LAN.

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