How to make Exim send out emails faster

In WHM, go to Home » Service Configuration » Exim Configuration Manager » Advanced Editor 
 
Configure the following settings to their respective values:

smtp_accept_queue_per_connection = 0 
split_spool_directory = true 
queue_run_max = 15 
remote_max_parallel = 15

Note: Setting queue_run_max to 0 will set it to unlimited/infinite, this will risk your server's load and memory. 
Make Exim run on ram disk, check this out : http://www.most-host.com/billing/knowledgebase.php?action=displayarticle&id=129
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