If you see the ‘QuickBooks is unable to send the email since your antivirus has blocked outgoing emails’ message, proceed with either of the solutions mentioned on this web page to resolve the antivirus blocking Quickbooks email problem.
Solution 1 - Changing your system permissions manually
Launch the main interface of the QuickBooks Desktop application on your computer.
Press the F2 key followed by the F3 key.
This will open the tech Help window on the screen.
Navigate to the Open File tab, search for the QBW.ini file from the displayed list, and click the Open File option.
The file will be opened in a Notepad.
Add the ‘[QBWEBMAIL]CUSTOM_CERT_ENABLE=1’ line without the quotes at the bottom of the text.