[Exim] Priority of processing messages in queue

Hi all!

Is there something like QoS for processing queue?
I have several thousand of messages in spool, most of them are bounces and
spam. Can I process somehow messages matching some criteria (for example
source or destination address/domain) befre others?

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Best wishes,
Dmitry Sergienko (SDA104-RIPE)
Trifle Co., Ltd.