QB Issue Resolution:

Oh no, I’m really sorry that you’re frustrated right now. I might be able to help clear this up for you! You see, when you send an invoice out of QuickBooks Online, you’re actually not sending that invoice out of your regular email box. QuickBooks Online is actually sending that invoice out through its own internal email, and it’s spoofing, or faking, your email on top of a generic one so your customer knows the invoice is actually coming from you. Therefore, your Gmail, Yahoo, AOL, or Outlook is actually unaffected.

Now, QuickBooks Online has been working this way with the emails as long as I’ve known, so I think you might have had another preference turned on in your Simple Start account that we need to turn on in your Essentials. I’m wondering if you perhaps had a preference on that copies you on all emailed sales forms, which would then get you a copy in your email box, just like you want. If you’d like to turn on that preference, we’re going to start by clicking the gear in the upper right of your Home screen and choose Company Settings from the dropdown. From here, we’re going to click Form Delivery on the left, and then (still on the left, under Form Delivery) we’re going to click Email Message. Check the box for Copy me on all forms sent by email, and then click Save in the lower right! This will ensure that you’re getting a copy of all the emails, and if you get one, you know your customer did, too!

Resolution for Issue 'Why aren’t the sent emails from Quickbooks showing up in my “sent” box in my email account?' available: Yes (Solved).
Source: Intuit Community forum.

Why aren’t the sent emails from Quickbooks showing up in my “sent” box in my email account?: 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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