QB Issue Resolution:

We can enable Access for less secure apps and see if this will work. Here’s how:

1. Log in to your Gmail Account from this link: https://www.google.com/settings/security/lesssecureapps
2. Set it to Enable.

Resolution for Issue 'I can not email invoices through Quick Books I have two email addresses and neither will accept my password. Firewall app is now allowed.' available: Yes (Solved).
Source: Intuit Community forum.

I can not email invoices through Quick Books I have two email addresses and neither will accept my password. Firewall app is now allowed.: 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 App
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