# Anti-Spam Options

This is the main anti-spam page, which provides explanations and links to all anti-spam functions. From here, you can access the pages for the server and host black lists, phrase filtering, statistical filtering, HTML Feature filtering, the white list, URL Domain black list and trusted IP addresses.

## Connection Filtering

Connection Filtering consists of spam tests that are performed whenever an SMTP server connects to IMail Server in order to send a message. These tests, which include server and host black list comparisons as well as verification checks, assure that a message is sent from a legitimate sender. For more information on connection filtering, click the appropriate link below to view the help topic for that page.

Server DNS Black Lists and Verification Tests

Host DNS Black Lists

## Content Filtering

Content filtering consists of spam tests that are performed on the body of an e-mail message. These tests, which include phrase, statistical and HTML filtering, assure that the message is not spam. For more information on content filtering, click the appropriate link below to view the help topic for that page.

Phrase Filtering

Statistical Filtering

Advanced Statistical Filtering

HTML Feature Filtering

White List

URL Domain Black List

Content Filtering for Authenticated Users. Select this option to enable content filtering for all messages that are received from authenticated users.

Note: Even when this option is selected, content filtering is not performed on messages sent from system and host administrators. This prevents mail from being filtered twice in cases where a message is misidentified as spam and the administrator forwards it on to its intended recipient.

## Trusted IP Addresses

Trusted IP Addresses are IP addresses and ranges that you trust not to send spam. Messages that originate from one of the addresses entered on this page are processed immediately without going through any of the spam checks.

Trusted IP Addresses