How do I get ISMail to work behind a firewall, router, or proxy server?
A firewall, router, or proxy server is designed to be located between a user’s machine and the internet. It will hide the IP address of the user’s machine from view, thereby preventing direct access by external users or programs, some of whom may be malicious. ISMail operates on a very restricted set of ports and contains a number of security safeguards. It can be exposed for access to the SMTP (port 25), POP3 (port 110), and IMAP4 (port 143) protocols. Most firewalls, routers, and proxy servers can be configured to enable external access to these ports for one or more machines which they protect. Check the vendor’s user manual for instructions on how to do this. Typically, it can be done using a telnet program or web browser. Also, run the ISMail Setup Test for more information.
