email coming back "undeliverable"

I appreciate you taking the time to personally contact your tenants to confirm they received your emails, Angie3566. I'm here to help you resolve the undeliverable error you're experiencing, allowing you to manage your business operations and income transactions in QuickBooks Online (QBO) with ease and confidence.

When some of your customers aren't receiving your emails or if they appear as undeliverable, it’s often due to a temporary issue with the recipient's email server, or your email service provider isn't sending a notification of the delivery error. To resolve this, there are three solutions you can implement.

First, you can reset your company's email address to refresh your data in QuickBooks. To do this, follow these steps:

1. Sign in to your QuickBooks Online account.
2. Go to Settings and select Account and settings.
3. Select the Company section, then click Edit in Contact info.
4. Review each email address and make changes as needed.
5. Select Save, then Done. 

In case the issue persists, I'd recommend accomplishing the two other solutions stated in this article: Troubleshoot if customers aren't receiving emails from QuickBooks Online.

Additionally, once your customers settle their invoices, record those payments to keep your income accounts balanced. For a detailed, step-by-step guide on how to do this, check out this article: Receive invoice payments in QuickBooks Online.

Moreover, have you heard about our QuickBooks Live Expert Assisted team? They’re here to help you effortlessly sort your transactions and manage your finances. I highly encourage you to explore their services today. You'll be glad you did!

After following the solutions outlined above, your emails should now be sent successfully, Angie3566. If you have any other questions or concerns about managing your sales and income transactions in QuickBooks, don't hesitate to reach out. I'm always here to support you and ensure your success!