Web Reference: Postfix implements the following four built-in content inspection. classes while receiving mail: header_checks (default: empty) These are applied to initial message headers (except for the. headers that are processed with mime_header_checks). mime_header_checks (default: $ header_checks) Postfix header or body_checks are designed to stop a flood of mail from worms or viruses; they do not decode attachments, and they do not unzip archives. See the documents referenced below in the README FILES section if you need more sophisticated content analysis. One effective way to combat this is by configuring Postfix to use header checks with regular expressions to block unwanted emails. In this blog post, we’ll walk through how to set up header checks in Postfix to block spam emails.
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