I can help you with that, myshem.

To successfully send your invoices using an alias email (the additional email address associated with your webmail or Outlook account), you'll have to connect it first to your QuickBooks Desktop. You can follow the steps that I've listed below.

For Outlook:
 

1. Select Edit from the sidebar menu.
2. Choose Preferences.
3. Go to the Send Forms section.
4. From the My Preferences tab, Select Outlook and then click OK.
5. Follow the on-screen instruction to add your alias email

For webmail:
 

1. Select Edit from the sidebar menu.
2. Choose Preferences.
3. Go to the Send Forms section.
4. From the My Preferences tab, click the Add button and then add the email address.
5. Choose the Email Provider, and select OK.
6. Once done, click OK again.

I encourage reading this guide to learn more about the process: Connect your email to QuickBooks Desktop. Once you're all set up and ready, it's time to create and send your invoices.

With QuickBooks Desktop, you can also use and customize form templates so your customers will recognize your brand.

I'm just a post away if you need more help in completing your other tasks. Have a great rest of the day.