I am using Magento ver. 2.1.4
I am facing an issue in which order confirmation email is successfully sent sometimes and sometimes it's not.
Order Confirmation email sent

Order Confirmation email not sent.

Order Confirmation email not sent

I am using custom SMTP and I have tested it several times with success.
Can anyone enlighten some points where to check the things which may cause this type of issue?

  • Check debug.log, exception.log and system.log. Are you getting any helpful information there ? – user55548 Feb 25 '20 at 7:00

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