Spam filtering

How the filter decides what is spam, how to train it, and how to set what happens to suspect mail.

12 articles

Choosing your spam filtering settings The three ways spam filtering can be set up for your domain, and which one suits you. Every incoming message is given a spam score. The higher the score, the more certain the system is that the messag
Default Blocked File Attachments What file attachments are blocked by default? To view what file attachments are being blocked by Zimbra mail, you can do the following. Step 1. Login to the Control Panel and under 'Your Customers' cl
How to blacklist a sender's email address This article shows you how to blacklist individual emails using the sender's email address - and also how to blacklist all emails from a particular sending domain. Step 1. Login to the Control Panel a
How to enable Internal Impersonation Protection This article shows you how to enable Internal Impersonation Protection using Sender Policy Framework. Sender Policy Framework (SPF) is a validation system designed to prevent email spoofing - by verif
How to whitelist a sender's email address This article shows you how to whitelist individual emails using the sender's email address - and also how to whitelist all emails from a particular sending domain. Step 1. Login to the Control Panel a
I've been sent an email with an attachment and it’s being quarantined Email attachments matching a list of file types which are known to allow Malware to be installed onto your computer are blocked. This includes file types which are within Zip files. The list of blocke
Rules for spam filtering in Microsoft Outlook How to create rules to filter spam emails in Microsoft Outlook? We recommend that you create a new folder called “Spam” in the mailbox. You will then need to create a server side rule in O
Training the spam filter How moving a message into or out of your Junk folder teaches the filter, and how much difference one message makes. Marking a message as spam, or as not spam, feeds the filter. It learns from what you
Understanding Why an Email is Marked as Spam All emails which pass through the filtering system are evaluated against hundreds of different rules, each of which has a weighting based on the probability that the rule indicates spam. Each email is
When spam reaches your inbox Why some spam gets through, and what to do about it. No filter catches everything. What reaches you usually falls into one of two cases, and the useful response differs between them. A new spam campai
Why am I receiving a lot of unwanted email? How to tell whether the filter is missing the mail entirely or delivering it as suspect, and what to do in each case. The answer depends on what the filter made of the messages, and you find that out
Why suspect mail is not moved into my Junk folder Why a message you think is spam stayed in your Inbox. There are two explanations, and they need different answers. The filter did not consider it spam Nothing moves a message the filter judged clean.