We have magento 2.2.3 configured and has been working fine. Recently we had some issues with our smtp server (which is fixed now) but I notice there are too many PHP processes running all the time. and it slows down the server a lot. any ideas?
I think it may have something to do with the emails and it may be sending the emails it missed during the time our SMTP server had issues, I am getting firstname.lastname@example.org has exceeded its 24-hour sending limit. Messages to 252 recipients out of 250 allowed have been sent.