How does ClipMail work with firewalls?
ClipMail tunnels all of it’s communications using FTP (File Transfer Protocol) and a compatible set of extensions called MTP (Media Transfer Protocol). In order to use ClipMail with a firewall, the firewall must be configured to allow incoming and outgoing FTP traffic for a single specific IP address (the ClipMail chassis). Since FTP is an Internet standard, most firewall systems provide controls for enabling FTP to selected IP addresses, thus configuring the firewall to allow ClipMail access. Note: when configuring a complete system (two or more ClipMails), you must take into account the firewalls on both the sending system and the receiving system(s). In addition to passing FTP, the connection must support RPC commands. ClipMail has configuration settings that allow you specify and work with an FTP proxy server at both the local network and destination network (receiving ClipMail or FTP server). ClipMail also has a configuration setting that allows it to work with PASV mode.
