How to bloc unwanted mails in spasm

I think you meant to ask "How to block unwanted emails in SpamAssassin?"

SpamAssassin is a popular open-source spam filtering system that can be integrated with various email servers and clients. Here are the general steps to block unwanted emails in SpamAssassin:

1. Install and configure SpamAssassin:

If you haven't already, install SpamAssassin on your email server or client. You can find installation instructions for your specific operating system and email server combination online.

2. Update the SpamAssassin configuration file:

Edit the SpamAssassin configuration file (usually /etc/spamassassin/local.cf or ~/.spamassassin/user_prefs) to set the desired spam filtering settings. You can add or modify the following lines:

# Set the spam threshold (0-100)
spam_threshold 5

# Set the spam subject prefix (e.g., "[SPAM]")
spam_subject_prefix [SPAM]

# Set the spam header (e.g., "X-Spam-Level: ***")
spam_header X-Spam-Level: ***

3. Create a spam filter rule:

Create a new file in the SpamAssassin rules directory (usually /etc/spamassassin/rules) with a .cf extension (e.g., my_spam_rule.cf). Add the following lines to define a spam filter rule:

# Define the rule
header   X-Spam-Test      contains "phishing" : score 5.0

This rule checks if the email header contains the word "phishing" and assigns a score of 5.0 if it does.

4. Reload the SpamAssassin configuration:

Restart the SpamAssassin service or reload the configuration file to apply the changes:

service spamassassin restart

5. Test the spam filter:

Send a test email with a spammy subject line or body to your email account. SpamAssassin should flag the email as spam and add the spam headers (e.g., "X-Spam-Level: ***").

6. Monitor and adjust the spam filter:

Regularly monitor your email account for false positives (legitimate emails marked as spam) and false negatives (spam emails not marked as spam). Adjust the spam filter rules and settings as needed to improve the accuracy of the spam filtering.

Remember to always keep your SpamAssassin installation and rules up to date to ensure effective spam filtering.