Set EXIM to deliver more emails in a single moment

This is especially cPanel related post.

With many senders and especially when someone is sending newsletters – you want your EXIM to deliver more and faster. Default settings are not bad, but some of you might want to make them more aggressive. Please be cautious and monitor your servers!

So in cPanel – head to Exim Configuration Manager and then to Advanced Editor. There change the following values:

remote_max_parallel = 500
smtp_accept_max = 500
smtp_accept_queue_per_connection = 0
smtp_connect_backlog = 500

Find a button called Add additional configuration setting and add the following option:

queue_run_max = 100

Please note – these values are quite agressive. 🙂