I have a Windows 10 PC that I have my QB Desktop 2019 setup on.  I also have a full retail version of Office 2010 on this computer, so the Office program is a little old but still works.

The email address I have been using for my company emails is an outlook.com email address.

In Send Forms when were you setup email setting I see two active options:

Web Mail

and

Outlook

But there is a third which is grayed out:

Quickbooks Email

What is typically the considered the best method for emailing?