QB Issue Resolution:

Around April 6th some of the web based provider began imposing a stricter email validation policy that unfortunately caused Intuit to make some changes to how it delivers email messages.  The change is intended to prevent “spoofing” of email by spammers.

The change Intuit made was to send emails using the address [email protected]. This allows emails to be received by the majority of email providers, however it still may get flagged as spam and redirected to the Spam folder.

Hope this answer your question.

Resolution for Issue 'Emailing invoices to Gmail accounts are no longer going through to customers, why?' available: Yes (Solved).
Source: Intuit Community forum.

Emailing invoices to Gmail accounts are no longer going through to customers, why?: 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.

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