• Instructions For New Users
• Mail Blocks / Server Response Codes
• Features and Technical Info
• Technical Support

Did you know? 96% of all incoming email is spam.

1. Save your mail server Save internet bandwidth
2. Increase employee productivity
3. $$$$ Save Money $$$$
4. All with Flubix Spam Filtering Services.

Introduction

Introduction

Flubix.com Spam Filter works by redirecting incoming emails from the internet.  Normally, incoming email goes directly to your company’s email servers, whether they are onsite or hosted by a third party.  When the Spam Filter is setup, this incoming mail is redirected to the Flubix Spam Filter, passed through a variety of tests, cleaned of spam, and then sent on to your company’s email servers.  By working this way, spam email never reaches your company’s email servers which decreases load and resources need on those machines.

Web Interface

The Spam Filter web interface allows users to view contents of the spam quarantine as well as to make changes to their Flubix.com account.
 

Technical Information on the Flubix.com Spam Filters

Blacklists

• MAPS Servers - Our SPAM Filter server checks the IP address initiating the connection. If it is listed in one of its many DNS RBL blacklist servers the connection is refused. 
• SURBL Servers - Spam Filter scans the content of emails for any HTTP links and URLs. Every link found is then tested against one of the many SURBL DNS blacklists available. If present, the connection is refused. 
• Local IP Blacklist - Our SPAM Filter server checks if the remote server's IP address matches an entry in our local IP blacklist file, the email is rejected. 
• Local Domain Blacklist - The SPAM Filter gateway checks if the domain portion in the sender's email address is in your local domain blacklist file, the email is also rejected. 
• Local Country Blacklist - The sender's Country is tested to see if it is in our list of undesired countries. If so, the email is refused.
• Local FROM Email Blacklist - The sender's email address is checked against your local list of blacklisted email addresses. If present, it is rejected. 
• Local TO Email Blacklist - The recipient's email address is checked against your local list of blacklisted email addresses. If present, it is rejected.
• Attachment Blocking - SPAM Filter checks emails for specific attachments or attachment extensions. If found, the email is rejected. 
• Keyword Content Filtering - SPAM Filter checks email content and subject for specific keyword and/or phrases. If found, the email is rejected.
• Bayesian statistical DNA fingerprinting - The SPAM Filter features statistical DNA fingerprinting of incoming emails. This filter is self-learning, continuously analyzing your incoming traffic to improve its accuracy with time. 
• SPF - Sender Policy Framework - SPF fights email address forgery and makes it easier to identify spam, worms, and viruses. Domain owners identify sending mail servers in DNS. Spam Filter verifies the email sender address against this information, and can distinguish legitimate mail from spam before any message data is transmitted.
• Honeypot Emails - You can have a list of "honeypot" email addresses. Any email sent to an address in the list will cause the sender's IP to be blacklisted.
• Country Codes -  SPAM Filter checks the what country incoming connections are coming from.  Any emails sent from a county whose ip is listed will be blocked.
• Additional anti-spam tests - SPAM Filter can then optionally check to see if the recipient address has a % sign in it. Many SMTP servers are susceptible to being tricked into relaying with this. Connections can be rejected if the remote server does not have a reverse DNS PTR entry. You can also refuse connections if the remote server attempts more than n RCPT TOs in a single connection or if there are too many spaces in the subject line.

Which Emails Are Allowed (Whitelisted)

• Allowed domains - If the IP passes the DNS tests SPAM Filter then checks the recipient domain. If the domain is listed as a local domain, then the recipient is accepted. This is done to prevent spammers to use SPAM Filter to relay. 
• Excluded IPs - If an IP is blacklisted, but you really need to be able to receive email from that domain anyways, the domain can be added in an exclude list as to allow it to bypass the blacklist rules. 
• Excluded Domains - If an IP is blacklisted but you still wish to receive email from them, the IP can be added to an IP exclude list to allow it to bypass the blacklist rules. 
• Unfiltered Emails - If you have users who do not want to receive filtered emails, they can be accommodated by adding them to a pass-list. EMails addressed to them will bypass all of SPAM Filter rules. 
• Excluded FROM Emails - If you want a sender's email address to be excluded from all filtering rules, you can add it to an exclude list. 
• Authorized TO Emails - SPAM Filter will not deliver email to an address unless it is present in this list.
• Keyword Whitelisting - Keywords that, if found in the body or subject of emails, will bypass all filtering rules. 

Other Options

• Max Email Size - Incoming emails can be blocked if they exceed a certain size.
• Max number of spaces in subject line - Many spam messages contain large number of spaces and tabs, they can be filtered here.
• Reject if no reverse DNS - SPAM Filter can be configured to reject emails if the remote server does not have a valid reverse DNS PTR entry. 
• Reject if Empty "Mail From" - If this option is checked SPAM Filter will reject all emails with an empty "Mail From" field. Please note that this setting will delete legitimate email, as in email receipt notifications and some error emails. 
• Reject if "Mail From" = "Mail To" - Reject all emails where the sender's email is the same as the recipient's email. Note that this causes problems with users who send emails to themselves using EBay's web interface for example.
• Reject if "From Domain" = "To Domain" - SPAM Filter can reject all email where the sender's domain is the same as the recipient's domain. Usually your users will not go through SPAM Filter when sending emails to themselves, Spammers often use this technique.

Blocked File Types

• Most  executable file types are blocked