Difference between revisions of "Spam Mail Filter"
m (Protected "Spam" [edit=sysop:move=sysop])
Revision as of 09:02, 23 November 2006
Personal Spam Folder
All the user's suspected spam is put in a personal mail file -- /cs/spam/login (e.g. /cs/spam/george).
In order to view the folder, the user can do:
pine -f /cs/spam/login
pine -f /cs/spam/george
Note that each message in this file will have an extra header, X-Spam-Reason, explaining why it was caught.
Legitimate Mail in Spam Folder
Sometimes the heuristic spam-catching algorithm errs and legitimate e-mail is caught in one's spam folder. In such a case, one should either bounce ('b' in Pine) or forward the caught message to the address notspam@cs so that the spam database will correct itself. Note that this is an automated address so no human will read the contents of the message meant to you.
In addition to updating the global database, you should put the sender address of the legitimate e-mail in your ~/.nospam personal exception database descibed in the next section.
Personal Exception Database
Since legitimate e-mail can sometimes be caught in /cs/spam/login, the user can create a personal exception database ~/.nospam with a list of sender addresses to pass through to the user's main mail inbox without being put in /cs/spam/login -- note that the sender address can be extracted from the Return-path: header of the message (visible in full header mode).
Example contents of ~/.nospam :
email@example.com *@wildnose.com *@*.huji.ac.il jody@* firstname.lastname@example.org email@example.com
The above ~/.nospam file allows both individual addresses such as firstname.lastname@example.org and groups of addresses such as all users from the wildnose.com domain and all users in subdomains of HUJI plus the login jody from any domain.
An entry of '*' (asterisk) will cause all suspected spam to pass through to your regular mailbox effectively disabling spam filtering.
echo '*' > ~george/.nospam
Spam Folder Cleanup
Any message left for more than 30 days in /cs/spam/login will be automatically deleted.
Hint: if you are going away for more than a month, it's a good idea to disable spam filtering (as explained above) during that time in order to avoid losing legitimate messages caught in the spam filter.
Spam E-mail that Isn't Caught
Since the spam-catching algorithm is heuristic, it doesn't catch all spam and some spam e-mailings manage to get through. If spam reaches your regular mailbox (and, of course, you haven't turned off spam filtering in your ~/.nospam file), then you should bounce ('b' in Pine) or forward the spam message to the address spam@cs to update the global spam database.