Recently I did following task on a Magento Store:
- Upgrade from 2.2.6 to 2.2.7 - After upgrade, everything was working fine.
- Chanaged server to higher configuration - shared hosting to shared hosting.
Order confirmation mails stopped after server move. To test I registered a dummy user and got the welcome email.
There was some cron related issue. which i discussed and implemented as per my other question. Error in Cron with Directoy list - Magento 2.2.7
Below is the current cron setting. When cron was created using Magento SSH command, cron run time was all (*). Now its changed to */15 - by it self - not changed by me.
I checked many previous answers but, most of the answers suggest some code change. I am a not technical person. Since emails were going out on previous host, I feel this is a some setting related issue.