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Is there any way to configure delay in sending mails thru Postfix server (ubuntu 10.04Lts), what I'm trying to limit sending mail to 60 mails/min or 1 mail in 1Sec.

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Are you trying to rate-limit globally or per user? – Janne Pikkarainen Jan 20 '12 at 12:19
rate-limit globally – user103373 Jan 21 '12 at 7:12
up vote 0 down vote accepted

I would recommend Policyd/cluebringer

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What goal are you trying to achieve ?

Global rate limiting is almost never the right solution.

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Policyd mentioned by mangia is better complete solution to throttle all dispatches.

In postfix however you can throttle delivery per destination with:

Add smtp_destination_rate_delay = 1m for a minute gap between each delivery.

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