Firewall and Proxy Support
 Table of Contents
This feature enables you to send e-mail through other proxy servers
on your Local Area Network (LAN) or on the Internet. If the only way to
connect to the Internet on you LAN is through the firewall, you can use
this feature to run the program even if the direct connection to the Internet
is not available. If the main purpose of using PostCast Server is to handle
your personal outgoing e-mail on different networks and while traveling,
paying for the proxy service or using free socks proxy servers is the
way to go.
Solution for Port 25 Blocking and DNS Lookups
When the message is sent through the proxy server, your dynamic IP address
is not embedded in the message headers and detected by the remote mail
server. The default port for socks proxy is 1080. The program will be
able to send messages directly from your computer, even if the port
25 is blocked by your ISP. This feature also enables the program to
send messages to those servers that block connections from dynamic
IP addresses.
When to Use Firewall Settings
You can use the Firewall settings in PostCast Server for the following
situations:
- Sending
through a proxy server on the LAN
- Using
your ISP's proxy server
- Sending
through open proxy servers
- Sending
through paid proxy servers
Sending through
a proxy server on the LAN
A proxy server allows users on a network to use Internet services without
having a direct connection to the Internet. A proxy server allows all
computers on the network to use a shared Internet connection. Proxy servers
are intermediate servers which forward requests from clients to the Internet.
For more information see the Firewalls
and Proxies Explained topic.
Using your ISP's proxy
server
Some ISPs offer access to their socks proxy server. You can find out
if your ISP provides socks proxy access in the support section on their
web site. If they do, you can use their socks proxy server address to
configure the program to send messages. The default port for SOCKS proxy
is 1080 or 1081. Their server's IP address will be the source of your
outgoing messages instead of your dynamic IP
address that assigned to your computer at the moment your Internet
connection is established.
Sending through open
proxy servers
Companies and ISPs often use caching in proxy servers to reduce the
load on their networks. If nothing is blocking connections from the outside,
it is possible to connect to those open
proxy servers and send messages through them. There are also programs
available on the Internet that automatically redirect your traffic through
multiple proxy servers and are able to chain proxies together. See the
topics below for more information:
Sending through paid
proxy servers
Some companies offer a paid access to their proxy servers. You can use
their service to have a reliable way to send messages and to bypass all
the restrictions
imposed by your ISP. The most popular company is TheProxyConnection.com.
They have a lot of IP addresses and server names you can use to connect
to their socks proxies. This company has a strict policy against sending
Spam. The cost for the service is $24.95 per month. With this price tag,
their service is probably more interesting to businesses sending newsletters
and notifications to their customers than to individuals for sending private
e-mail messages.
HiddenSurf provides SSHsurf
Secure Tunneling Service access to their servers for $4.95 per month.
When you open an account, you need to contact them and let them know that
you would like the SSHsurf service to be activated for your account. Unfortunately,
I have not been able to get in touch with them after signing up. They
did not respond to my questions so I cannot guarantee that PostCast Server
will be able to send messages through their proxy servers.
If you know about any other company that provides access to their proxy
servers, please
let me know.
See Also:
- Why use PostCast Server
- Firewalls and Proxies Explained
- Settings
- Open
Proxy Servers
- SocksChain
Application
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