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P800/P802
White Paper, January 2003
58
corresponding ‘Synchronised e-mail account’ inbox on the P800. Messages and replies written
using this account on the P800 are transferred and sent via the PC.
Web and WAP based E-Mail can, of course, be accessed using the P800’s browser.
Technical Explanation of E-Mail
Configuring and using the E-Mail client in Messages is very straightforward in most cases,
especially where the e-mail service is provided by the mobile operator. Reading e-mail from third-
party ISP services will normally work over GPRS with no problems. Sending e-mail may require
some special configuration, however. This section provides a basic explanation of the end-to-end
path involved in an e-mail transaction and some of the issues that may be encountered when
using GPRS. Note that all examples refer to a POP server, but equally apply to an IMAP server.
A more detailed explanation of GSM and GPRS is given in the chapter ‘Technical Explanation of
CSD, HSCSD and GPRS’ later in this document.
A common PC solution is to connect to the internet using a modem and a circuit-switch call over
the public telephone network. In the diagram below, User B’s laptop PC uses this method to
connect to the internet using Internet Service Provide ISP B.
User B has an e-mail address me@isp-b.net
and communicates with the POP server at ISP B to
receive mail and uses the SMTP server at ISP B to send mail. Note that these servers are inside
the ISP’s facility and that a firewall exists between the ISP and the internet itself.
When me@isp-b.net
sends an e-mail to me@isp-a.net, the e-mail client on User B’s laptop will
connect to the SMTP server and ISP B, which will in turn connect over the internet to the POP
server at ISP-A and transfer the message. The e-mail will be stored here until User A connects to
retrieve waiting messages.
User A has a P800 and therefore several different ways of connecting to the internet:
1. Using CSD/HSCSD to an ISP service offered by the network operator or a third party
2. Using GPRS to connect to an e-mail service offered by the network operator
3. Using GPRS to connect to an e-mail service offered by a third party