On 5/21/24 13:27, Henri Schomäcker via Postfix-users wrote:
So what we need to do is to limit the sending rate to all MX servers under protection.outlook.com.

But it does not work with my configuration, all mails are still beeing sent directly one after another, and I can't find out why.

So my question still remains: What's wrong with my config?

Are back-to-back messages going to the same domain, or to different domains all hosted at the same MX?

postfix's rate-limiting buckets are keyed either by the full destination email address (if *_destination_recipient_limit is 1) or by the domain part of the destination email address. There isn't a way to rate limit by the SMTP destination (however you define that).

This has been discussed on this within the last year or so. I believe the conclusion at the time was that postfix doesn't have any easy way to do what you want.
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