QB Issue Resolution:

Unfortunately, Intuit considers this a safety feature, so you cannot.  All you can do is to change the email address that they will respond to.

  1. Go to the Gear
  2. Select Account and Settings.
  3. Select the Company
  4. Click Contact info.
  5. Update the box under Customer-facing email.
  6. Click Save.
  7. Click Done.

Resolution for Issue 'Changing outgoing Email address' available: Yes (Solved).
Source: Intuit Community forum.

Changing outgoing Email address: 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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