[Mimedefang] rate-limiting for outbound mails per sender

[Steffen Kaiser]

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On Sun, 9 Feb 2014, Marcus Schopen wrote:

> what would be a good way to implement rate-limiting for outbound mails
> per sender e.g. 50 recipients per smtp_auth sender per hour?

I do this in filter_begin. There I detect the sender, assign a "SenderID" 
based on different rules and query a SQL database about the sum of 
recipients of this SenderID in the last hour & day. If the SMTP quota is 
not exceeded, the tuple (scalar(@Recipients), SenderID, NOW()) as added to 
the database.

I purge old entries daily.

- -- 
Steffen Kaiser
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