Product manual

GFI MailEssentials 2 About GFI MailEssentials | 19
4. If configured, email monitoring is next executed and the appropriate actions taken.
5. If enabled, Auto Whitelist adds the recipients' email addresses to the auto-whitelist. This
automatically enables replies from such recipients to go to the sender without being checked for
spam.
6. Email is sent to the recipient.
2.4 Email scanning and filtering engines
GFI MailEssentials contains a number of scanning and filtering engines to prevent malicious emails,
spam and other unwanted emails from reaching domain users.
2.4.1 Malicious emails' scanning 19
2.4.2 Content filtering engines 19
2.4.3 Anti-spam filtering engines 19
2.4.4 Filters running at SMTP level 20
2.4.5 Other engines 20
2.4.1 Malicious emails' scanning
The following engines scan and block emails containing malicious content.
Email scanning
engine
Description
Virus Scanning
Engines
GFI MailEssentials uses multiple antivirus engines to scan inbound, outbound and internal emails for
the presence of viruses. GFI MailEssentials ships with Vipre and BitDefender Virus Scanning Engines.
You can also acquire a license for Norman, Kaspersky &McAfee.
Information
Store
Protection
When GFI MailEssentials is installed on the Microsoft
®
Exchange server machine, Information Store
Protection allows you to use the Virus Scanning Engines to scan the Microsoft
®
Exchange Information
Store for viruses.
Trojan &
executable
scanner
The Trojan and Executable Scanner analyzes and determines the function of executable files
attached to emails. This scanner can subsequently quarantine any executables that perform
suspicious activities (such as Trojans).
Email exploit
engine
The Email Exploit Engine blocks exploits embedded in an email that can execute on the recipient’s
machine either when the user receives or opens the email.
HTMLSanitizer The HTML Sanitizer scans and removes scripting code within the email body and attachments.
2.4.2 Content filtering engines
The following engines scan the content of emails, checking for parameters matching configured rules.
Email scanning engine Description
Keyword Filtering Keyword Filtering enables you to set up rules that filter emails with particular keywords or a
combination of keywords in the body or subject of the email.
Attachment Filtering Attachment Filtering allows you to set up rules to filter what types of email attachments to
allow and block on the mail server.
Decompressionengine The Decompression engine extracts and analyzes archives (compressed files)attached to an
email.
Advanced Content
Filtering
Advanced Content filtering enables scanning of email header data and content using
advanced configurable search conditions and regular expressions (regex).
2.4.3 Anti-spam filtering engines