for 3.71 try this version
https://vborg.vbsupport.ru/showthread.php?t=167274
PROBLEM
Hi, I've come across a problem. I have this installed but when I check my schedule logs, the cron does not appear to have been run. Its set to run every 10 minutes.
Even when I click "run now" from the schedule task manager menu in admincp, it goes to this screen "Process Mail Queue for vBulletin 3.7" but gets stuck there.
Any advice please?
My email unesent queue is growing as none are been sent. Any help or advice would be greatly appreciated thanks Mally