QB Issue Resolution:

Check out this thread:

https://community.intuit.com/questions/1101578-can-i-see-if-a-customer-has-opened-the-emailed-invoic…

Resolution for Issue 'Where can I confirm that an email has been sent to a client?' available: Yes (Solved).
Source: Intuit Community forum.

Where can I confirm that an email has been sent to a client?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Check out
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