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computing:accounts:email:spam

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computing:accounts:email:spam [2008/05/28 12:25] – allancomputing:accounts:email:spam [2011/01/14 18:36] (current) – allan
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-====== Spam ======+====== Spam Control and Deterrence ======
  
 ===== What to do about Spam ===== ===== What to do about Spam =====
-  * There's not much we can do to prevent people from sending it to you +  * We do make best effort to prevent spam sent to you from being delivered 
-  * You can use our filtering service to reduce it, if you like (see below) +  * There's not much we can do to prevent attempts to send it to you; we can't follow up and investigate individual messages. 
-  * There's a lot more information at the OIT Spam information page and at CAUCE (Coalition against Unsolicited Commercial Email) +  * There's a lot more information at the [[http://www.oit.umn.edu/security/topics/spam/|OIT Spam information page]] 
 + 
 +===== Greylisting and blacklists ===== 
 + 
 +We run the OpenBSD [[http://www.openbsd.org/cgi-bin/man.cgi?query=spamd&sektion=8|spamd]] service to prevent or delay message delivery from suspect servers. In addition, systems which attempt to send messages to nonexistent accounts or defunct physics hostnames are temporarily blacklisted.  
 + 
 +You can view a list of messages which were blocked or greylisted (delayed) on your [[https://www.physics.umn.edu/resources/myphys/|MyPhys]] page. Delayed messages should normally arrive within about a half hour (although to some extent this will depend on the sending mail system), and once a message has been delivered, future messages from that source will have no delay.
  
 ===== Spam Filtering ===== ===== Spam Filtering =====
  
-We now run the SpamAssassin filter on all incoming messages to our mail system. SpamAssassin simply assigns each message a "score", based on the content.+We also run the SpamAssassin filter on all incoming messages to our mail system. SpamAssassin simply assigns each message a "score", based on the content.
   * Messages with a score of 5 or less are left alone   * Messages with a score of 5 or less are left alone
-  * Messages with a score between 5 and 8 have the text ****SPAM added to their subject line befrore being delivered. +  * Messages with a score between 5 and 10 have the text ****SPAM added to their subject line before being delivered. 
-  * Messages with a score over 8 are rejected. +  * Messages with a score over 10 are rejected (our system refuses to deliver them to you and the sender receives a bounce message). 
  
-However, we will be checking the results of our spam scoring over time, and shall probably revise some of these thresholds downwards.+==== Custom Filters ====
  
-You can change settings within your account to take further action based on this score, such as move messages to a different folder, or even delete them completely.+You can change settings within your account to take further action based on the spamassassin score, such as move messages to a different folder, or even delete them completely.
  
 These settings are made within the Physics webmail system. As an example, let's say you want to filter those messages with scores with 6 or higher, so they are placed into a separate folder instead of your INBOX. These settings are made within the Physics webmail system. As an example, let's say you want to filter those messages with scores with 6 or higher, so they are placed into a separate folder instead of your INBOX.
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   * Under Condition change the first drop-down box which says **To: or Cc** to **X-Spam-Level**   * Under Condition change the first drop-down box which says **To: or Cc** to **X-Spam-Level**
   * In the text box after contains enter <code>******</code> (that is, 6 stars)   * In the text box after contains enter <code>******</code> (that is, 6 stars)
-  * Under Action choose **Move message into** and select a folder name as the destination. //Don't choose the global "spam" or "notspam" folders, as this is not their intended purpose - see below for more on these folders.//+  * Under Action choose **Move message into** and select a folder name as the destination.
   * Under **Additional actions**, check **STOP: If this rule matches, do not check any rules after it.**   * Under **Additional actions**, check **STOP: If this rule matches, do not check any rules after it.**
   * Click **Add New Rule**   * Click **Add New Rule**
  
-===== Understanding SpamAssassin Scores =====+==== Understanding SpamAssassin Scores ====
  
 You can see the set of rules which triggered a spam tag for a particular message in the header "X-Spam-Status", and the list of SpamAssassin's default scores can be found here: [[spam_default_scores]] You can see the set of rules which triggered a spam tag for a particular message in the header "X-Spam-Status", and the list of SpamAssassin's default scores can be found here: [[spam_default_scores]]
  
computing/accounts/email/spam.1211995508.txt.gz · Last modified: 2008/05/28 12:25 by allan

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