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How to restrict the speed of outgoing mail queue processing?

kiav

Basic Pleskian
Plesk 12.5.30 u8
CentOS 6.7
postfix

I need to restrict the speed to 2000 emails per hour from server. This number includes both mail sent by scripts, WEB-mail and by EMail clients such Outllok. But email should be successfully placed into queue without any error return to script or email client even when the limit is exceeded.

How can I do these settings? How can help me "Switch on limitations on outgoing email messages" in "Tools & Settings"?
 
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