Re: [courier-users] Filter API

Sam Varshavchik wrote:
> Aleksandar Lazic writes:
>>
>> The concept is described here:
>>
>> http://www.postfix.org/FILTER_README.html
>
> The "NOTE:" under "Principles of Operations" gives away the fact that
> its approach generates backscatter.

Looking at the document, it appears to do the same thing as
pythonfilter's "courier.xfilter" module. The module will allow you to
modify a message, and reinject it into the queue.

The primary different between courier.xfilter and Postfix's mechanism is
that if you choose to modify a message, you more or less implicitly
accept the message for delivery. The documentation indicates that you
should return a success code, although a module could opt not to. I
should modify that section of the documentation to better explain why
you should return a 200 or 000 code...


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