Configure exchange to act as POP3 and SMTP server

We use MS Exchange on Small Business Server 2003.
Currently we get all our email through with POP3 connectors from our ISP mail accounts

We want to have the ability to allow remote email clients (Cell Phones actually) to collect mail from the exchange server by POP3 and send mail using the exchange server as SMTP.

Can anyone offer a step-by-step guide?
Please include details of relevant ports that need to be open on the firewall :)

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Lee W, MVPTechnology and Business Process AdvisorCommented:
You need to open ports 25 and 110.  But I strongly recommend against using the server as your cell phone's SMTP server.  Use the Cell companies SMTP servers.  Opening your SMTP port could get your domain(s) on blacklists if spammers detect the open SMTP.

110 is POP3
25 is SMTP

I'm fairly certain, if those ports are open, then your set - I don't believe there is any further setup, but it's been a while...

Also, be aware you are weakening your networks security by making mail available without requiring the use of VPN (which I doubt your cell phones have the ability to do).
By enabling the POP3 service and checking exchange permission in AD is all you need to connect via POP3.  Make sure you have the option set to provide an outgoing username and password for the smtp service.  The fear that leew brought up is that sometimes people setup SMTP servers incorrectly and thus inadvertantly create open relays (smtp servers that require no password to send mail through).  In exchange 2000 and 2003 this should be taken care of by default. I use my cell phone through sprint to access the internet and use a clients SMTP server to send mail through outlook, works like a champ.  The other option is to use RPC over HTTP but this requires windows service pack1 and outlook 2003.

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