Hi @JanbonN got it. I've sent a feedback.

Regarding Gmail, I am unable to do that because our provider is Outlook.

I am wondering, after years of working correctly, it suddenly does this. Previously, all my emails come from the address "my company name"<[email address removed]> and when I send out an invoice, the FROM portion even shows this address (see attached image). Then, when email arrive the from sender address becomes: "qbo" <[email address removed]>. Is there a problem with Quickbook's email client or forwarding? 
Is it possible to fix this soon as we have received feedback that our mail looks like spam or is sorted into spam folders?