TCP/IP Based POP3 Account

Some ISP's are providing TCP/IP Based POP3 Accounts. How they are providing this services.

Whether they are creating this account in ther router?
What Configuration changes are required for that.

How they are stopping browsing. ?
How to enable only email for that user?

Normally if a user is coming through router through dialup.., he has to type his username & password. after this he has to type ppp & press F7 . In this way anybody can access internet..  If they are a TCP/IP based POP3 user how can i disable browing for that perticular user.?

waiting for an early reply.
mon1Asked:
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samriCommented:
Mon1,
   
   Just to share some of my knowledge with you.  
   Yes, most ISP that are offering POP3 services are via TCP/IP network, that is not because they like to, but because that's the protocl the POP3 "talks".  Somehow it becomes a direct relationship, if you were to offer POP3 mailboxes, it had to be via TCP/IP.
   Regarding the Email account setup.  No, it's not done on the router.  Rather, there is a dedicated server(s) that handle POP3 mailboxes.  Be it a UNIX, NT, or any OS, there must be Utilities of some kind, or Management tool that they utilized to create and manage those mailboxes.  And definately not on the router.
   How do they allow only Email and not browsing.  Well that depends on the implementation.  The simplest way is to configure the router (or the terminal server), only to allow POP traffic to go thru (and some necessary traffic, DNS, SMTP, ICMP, etc), and absulutely NO web traffic.
   Yes you are right about the TCP/IP traffic.  Even though web is also another traffice (that most servers listen on port 80 TCP), the ISP however can decide not to let traffic with destination port 80 TCP to go thru, in fact they would be able to filter almost any traffic at all.

   I hope this could give you some clue on how the TCP/IP or generally the Internet works.

Happy Exploring

Samri
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AGBCommented:
POP3 is use as protocol for access to users e-mail box and so it not related to Internet access.

For to enable only e-mail (with POP3 help) to user you can configure firewall (packet filter) rules to the effect that users IP address may send SMTP packets (25 port) and receive POP3 packets (port 110). Other packets can be rejected.
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