Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador descarregar pdf (Página 51)

Chapter 1 Mail Service Setup 51

7 Choose how often to update the junk mail database updated, if desired.

8 Click Save.

For an explanation of other options, see “Filtering Mail by Language and Locale” on

page 52.

Manually Training the Junk Mail Filter

It’s important to teach the filter what is, and what isn’t junk mail. Initially, the filter won’t

be very accurate at marking junk mail, but you can train it to do better. Accurate

training requires a large sample, so a minimum of 200 messages of each type is

advised.

To train the filter:

1 Choose a mailbox of 200 messages made of only junk mail.

2 Use Terminal and the filter’s command-line training tool to analyze it and remember it

as junk mail using the following command:

sa-learn --showdots --spam <junk mail directory>/*

3 Choose a mailbox of 200 messages made of only good mail.

4 Use Terminal and the filter’s command-line training tool to analyze it and remember it

as good mail using the following command:

sa-learn --showdots --ham <junk mail directory>/*

If the junk mail filter fails to identify a junk mail message, train it again so it can do

better next time. Use sa-learn again with the --spam argument on the mislabeled

message. Likewise, if you get a false positive (a good message marked as junk mail),

use sa-learn again with the --ham argument to further train the filter.

Automatically Training the Junk Mail Filter

The junk mail filter needs to be told what is and isn’t junk mail. Mac OS X Server

provides a method of training the filter automatically with the help of the mail users.

The server runs an automated command at 1 am (a cron job) which scans two specially

named mail users’ inboxes. It runs SpamAssassin’s sa-learn tool on the contents of the

inboxes and uses the results for its adaptive junk mail filter.

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Apple Mac OS X Server Version 10.4 or Later Manual do Utilizador Página 51