postfix--- via Postfix-users:
> > what's the main difference between a policy server and a milter?
> 
> 
> Policy Server:
>   - Coded quickly in scripting language
>   - Lightweight, simple, and fast to setup
>   - Is only provided limited header information by postfix for evaluating

No headers or body. 

Supports complex conditions on helo, client, recipient, and other
envelope information.

Example: postfwd, https://www.postfwd.org/

> 
> Milter:
>   - More complicated to setup and code
>   - Has access to the entire email (Headers, body, attachments)
>   - More robust for large volumes of email

Supports complex conditions on envelope (helo, client, recipient,
etc.) and message content.

Example: milter-regex, https://www.benzedrine.ch/milter-regex.html

        Wietse
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