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If you installed the isa server version you need to check the rules on it so that computers not on the domain are allowed to connect via pop3 port 110, sending is done via smtp and it uses a different port (25) so that may be the problem.
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If you installed the isa server version you need to check the rules on it so that computers not on the domain are allowed to connect via pop3 port 110, sending is done via smtp and it uses a different port (25) so that may be the problem.

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Pointed in right direction, thanks.
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I have just set up SBS 2003. I have connected a PC to the domain and send email via exchange and receive emails via the POP3 connector. However there are a number of MCE PC's not connected to the domain but using SBS as the DHCP server. Since I have made this change I can't recieve POP3 emails via outlook but I can send them. Do I need to configure something? I guessed as outlook was just using a pop3 account it would bypass SBS. Thanks.
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I have just set up SBS 2003. I have connected a PC to the domain and send email via exchange and receive emails via the POP3 connector. However there are a number of MCE PC's not connected to the domain but using SBS as the DHCP server. Since I have made this change I can't recieve POP3 emails via outlook but I can send them. Do I need to configure something? I guessed as outlook was just using a pop3 account it would bypass SBS. Thanks.

POP3 problems with non domain PC's

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.