Was 7.5.3 changed for VZ to not run the qmail-send as a pid for fast delivery and instead a qmail_check cron job put in to run every 10 minutes to check the queue and send email?

If so, I assume to save resources? Was this documented anywhere . Do you know the number of complaints we had from people yelling that email delivery was taking 10+ minutes?

 

This was pointed out in another thread, I believe it was earlier in July. You should send the complaint directly to Plesk, they don't officially monitor these forums.