Hello Bastian,

Thanks for the advice, I will consider it. I am pretty sure to know how to do 

However, because the CardDav server is on the same host, I think it should not 
be an issue. 

I made a few tests, and the performances are even better than some anti-spam 
milters like SpamAssassin...

The other reason is I want to add headers to the email, and let the users 
decide how they want to process personal emails.

Perhaps I can add headers with a global sieve filter as well, and have the same 


On 12 March 2018 05:20:00 GMT+00:00, Bastian Blank 
<bastian+postfix-users=postfix....@waldi.eu.org> wrote:
>On Fri, Mar 09, 2018 at 11:53:00AM +0000, André Rodier wrote:
>> I would like to know if there is any milter for postfix that would
>> me query a CardDav server?
>Well, don't.  Milter is latency sensitive and it will break mail
>delivery if you don't manage to get it right.
>If you use the correct Sieve implementation you can ask it to run stuff
>for you:

André Rodier

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