spam firewall

Spam Firewall

The term spam is used for a number of things these days.
When the graylisting mx rejects a message from a spammer, the spammer generally won't attempt redelivery (because he has plenty of other addresses to try, and can't be bothered with following up on rejections).
Blacklist all the senders that you don't know or email addresses from previous spam emails.
It will prevent the spammer from sending more spam using the same email address to your inbox.
Any emails that are not in your whitelist, will be sent to spam inbox.
The reason that there is so much spam email is that it works.
Certain spammers like to use webmail whose services vary widely in how they document the transaction in the smtp mail header, and it can be difficult to trace webmail messages back from the webmail service to the host from which the webmail service was accessed.
Graylisting is a technique used by a mail exchanger host to defend against spam deliveries by temporarily rejecting all mail from unrecognized sources.
An open proxy is a third-party computer that has been configured to serve spammers by untraceably relaying their mail, hosting, or guarding their websites, or performing other tasks.
Integrated spam blockers are the most popular types of spam filtering software.
The options allow you to mark your mail as spam, or not as spam, etc.
an smtp mail server used by spammers to route their bulk email through.
Open relays allow spammers to hide their identity.

Spam Firewall