SPAM Blocking

Overview Hexamail's server antispam filter eliminates the cost, time and frustration your workers spend on unsolicited email (junk/spam) by blocking the majority of spam email before they ever reach your mailserver. Hexamail's multilayered antispam filtering ensures the best of breed techniques are used to provide total protection from all email bourne threats including spam, malware, spoofing, phishing and virus. Automatic built in heuristics are combined with admin and user configurable rules and optional features such as greylisting and challenge response to allow you to tailor your spam solution to your exact needs. Unlike the majority of other antispam solutions, Hexamail is a server software solution that runs on your network so your email is never sent to the cloud or any third party servers for analysis. This ensures your privacy is guaranteed, eliminates any additional latency in receiving email and prevents your email being dependent on a third party service that can suffer downtime or hacking. Integrated analysis of outgoing email traffic ensures false positives are minimized by automatic whitelisting.


Highly automated accuracy with 99% elimination of spam virus and malware, automatic whitelist generation from outgoing email analysis


Only incoming email from the Internet or POP3 accounts are filtered. Customer outbound and internal email is not filtered


Suspect email are are quarantined or forwarded to an appropriate recipient


You maintain control of your own email systems without having to rely on third party servers or services


Unrivalled easy to use configuration through a remote administration interface


5 minute plug-in SMTP installation with no changes to DNS or MX records required


Highly optimized natively compiled code ensures the highest performance filtering and no email latency


Add security options to your existing email infrastructure to prevent open relay, dictionary harvest attacks


Privacy is guaranteed because email is never sent to the cloud for analysis

Automatic Whitelisting

Automatic white list generation from senders contacts and email message threads coupled with intelligent on-the-fly white list detection. This ensures legitimate senders email do not get blocked by the SPAM blocker

Challenge Response

Challenge-response features to allow senders to verify and have email automatically accepted and their address whitelisted

Grey listing

Temporarily fail connections from new IP, sender and recipient sets to effectively block spam software, and BotNets. Automatically whitelists your regular senders so that no delay is experienced for legitimate communications.

Honey Pot

Dynamic Adaptive Honeypot. The Honeypot uses spam sent to chosen honeypot addresses to automatically generate adaptive intelligent agents, known as "bees". These identify and block similar spam. This provides realtime protection against new spam types, sender IPs, and specifically image spam.

Bayesian Matching

Full Bayesian statistical pattern matching providing highly accurate (better than 99%) spam blocking with minimal false-positives (emails incorrectly marked as spam). Selectable pattern matching subcategories allowing bypass of pattern matching for specific types of spam, such as 'Money Making', 'Recruitment', 'Privacy', 'Competitions' etc. Multiple thresholds for pattern matching allowing marking, blocking or automatic deletion of identified spam. Email accepted or deleted from the quarantine is used to further the Bayesian matchign for future email.

White listing

Easy to use white list management facility allowing you to maintain lists of email addresses that you never want blocked. Users each have their own personal white lists and senders can be automatically whitelisted if a blocked email is released from the quarantine.

SPF Checks

Full SPF (Sender Policy Framework/Sender ID) support and failure blocking. Helps prevent phishing attacks

Domain Keys Checks

Full DomainKeys Identified Mail (DKIM) support and failure blocking. Helps prevent phishing attacks

URL Blocking

Full support for DNS-based URL checking of URLs within emails Built in SURBL support for DNS-based URL checking of URLs within emails

IP blocking

Block IP addresses from relay, sending inbound email. Whitelist IP addresses so that they are never blocked, or white list IPs for relay. Use DNS based databases to block known spam IP addresses

DNS Based Spam protection

Full support for multiple configurable DNS based spam protection databases. Dial-Up User Lists (DULs), Real time Black hole Lists (RBLs), Spamhaus SBL, XBL and Relay Spam Stoppers (RSS) are all supported! Override to allow receipt from known good sender addresses

Spam Quarantine

Spam quarantine with safe email viewer that doesn't trigger virus, worms, popups or other malicious code. The administrator can optionally allow users to review their own spam using a web-based quarantine view. Users and administrator can be automatically alerted when they have spam in the quarantine to review

Content Checks

Blocking based on strings, wildcards, word/phrase, regular expression matches in the email content or subject Configure different actions to perform for each expression matched.

Sender Blocking

Blocking based on strings, wildcards and phrase matches in the email sender address Elimination of emails with missing, undisclosed, invalid or suspect sender addresses Easy to use one-click sender blocking facility to allow direct blocks of unwanted newsletters or repeat offenders.

Country Blocking

Blocking based on country of client IP Address. This allows weighting, blocking or deletion of email originating from specified countries.

Image Analysis

Configurable automatic blocking of graphical or image-based emails. The system performs sophisticated checks on any attached or included images to identify image based spam and block it.

PDF attachment spam blocking

Hexamail automatically inspects PDF attachments for textual and image based spam and blocks if an attachment contains spam content

Automatic ZIP unpacking and content analysis

Hexamail automatically unpacks ZIP attachments, identifies malicious contained files and even reads the textual content to detect spam attachments

Header Checks

Configurable automatic blocking of emails with suspect MIME headers

NDR Spam Attack Prevention

Automatically block NDR Spam attacks by detecting NDRs from spoofed recipients, to false recipient addresses, or to nominated bad addresses.

Configurable automatic blocking of emails from suspect Mailer programs

Automatic text style and font analysis and blocking

Configurable automatic blocking of emails containing web bugs, inline framesets, popup windows etc.

Configurable automatic blocking of emails with dangerous or suspect attachments

Configurable automatic identification and blocking of emails with suspect recipient lists

Configurable automatic verification of replyto/sender

Configurable spam action options, including quarantine storage, subject line marking, forwarding, blocking and deletion