I appreciate you getting back to us, @myshem.
Allow me to clarify things about setting up alias email in QuickBooks Desktop (QBDT).
At this time, QuickBooks only allows you to set up your primary email address to email invoices. You can follow the steps (For webmail) provided by my colleague KlentB above to add your Gmail in QBDT.
I know how beneficial it is for you and your business to add an alias email. However, we only support primary email addresses.
I'm also adding these articles to know more about setting up webmail in QBDT:
Keep in touch if you need more help with emailing invoices, or if there's anything else I can do for you. Of course, I am always here ready to help you whenever you reach out. Have a great day!
