Squid filter email

A squid filter email!

Squid is a popular open-source web proxy caching server that can be used to filter and block unwanted emails. Here's a basic guide on how to set up a squid filter email:

Prerequisites:

1. You have a Squid server installed and running on your system.
2. You have a mail server (e.g., Postfix, Sendmail, or Exim) configured to forward emails to your Squid server.

Step 1: Configure Squid to listen for email

Edit the Squid configuration file (squid.conf) and add the following lines:

http_port 3128
email_port 2525

This tells Squid to listen for HTTP requests on port 3128 and email requests on port 2525.

Step 2: Configure Squid to filter email

Create a new file called email_filter.conf in the Squid configuration directory (e.g., /etc/squid/). Add the following lines:

email_filter on
email_filter_type regex
email_filter_regex ^spam|phishing|virus

This enables email filtering, specifies the filter type as regular expressions, and sets the filter pattern to match emails containing the words "spam", "phishing", or "virus".

Step 3: Configure your mail server to forward emails to Squid

Edit your mail server configuration file (e.g., main.cf for Postfix) and add the following lines:

smtpd_recipient_restrictions = check_policy_service unix:private/squid

This tells your mail server to forward emails to the Squid server for filtering.

Step 4: Restart Squid and your mail server

Restart both Squid and your mail server services to apply the changes.

Step 5: Test your email filter

Send an email to your Squid server with a subject line containing one of the filtered keywords (e.g., "Spam email"). Squid should block the email and log the filtering action.

That's it! With these steps, you've set up a basic email filter using Squid. You can customize the filter rules and patterns to suit your specific needs.

Remember to always test your email filter with a variety of emails to ensure it's working correctly and not blocking legitimate emails.