The Internet is flooded with soliciting E-mail messages distributed to millions of E-mail addresses. These messages are known as "spam".
Spammers fill your user Mailboxes with a huge amount of unwanted messages, not only overloading your network and Server resources, but making mail retrieval very slow and difficult for your users.
Besides the methods described in this section, additional methods are described in the Denied Addresses section.
In order to distribute their messages to millions of E-mail addresses, spammers try to use any SMTP mail server on the Internet as a relay: they deliver one copy of the message to each mail server, requesting that server to route the message to several hundred addresses. This practice not only overloads your Server resources, but it places you at risk of being recognized as a spammer (since "spam" messages come from your Server).
The CommuniGate Pro Server has Protection Options that can help you to deal with "spam".