[exim] delay between processing mail in queue

Hi guys,

    I would like to ask somebody that it is posible to make delay  
between procesing e-mail in queue. For exmaple client sent huge  
amount of e-mails which is placed into queue, and I want to create  
delay for example 3 seconds between each e-mail is processed. Example:

Client -> Queue; first mail from queue is processend and sended;
delay 3 seconds next e-mail is processed. It is posible to do this?

Thanks in advance,

--
Toth Milan
milan@???
http://toth-online.com