Magento 2.2.4 Order Confirmation Email Not Receive by Customer and Newsletter Emails Received by Subscriber Successfully
Install Following Extension in magento website i have use this extension in magento 2.2.4 and my issue is resolved https://github.com/sashas777/bug-from-email
If you have enabled "Asynchronous sending" in your settings "Stores > Configuration > Sales > Sales Emails > General Settings > Asynchronous sending", make sure your cron is running correctly. You can make Magento send emails instantly by disabling this option.
This issue has been discussed further in https://github.com/magento/magento2/issues/15476