Why is there still an issue with sending customers invoices?We can’t reach this customer. Please verify the email address with your customer or use a different email.

Receiving timely payments is essential to monitoring your business finances, andy. We can troubleshoot to eliminate the error and ensure you can send invoices successfully.

First, I'd like to know if you're using Gmail-based email to send invoices to your customers. If so, you may need to update your online delivery settings. Follow the below steps:

1. Go to the Sales menu and hover your mouse over Invoices.
2. Locate the transaction and then select Edit.
3. Click the Review and Send button to see the form to be delivered.
4. On the From field, choose Remove Gmail under the dropdown.

After deleting that email, please re-add the Gmail address. Once you reconnect to your Google Account, a pop-up window will appear where you can tick the checkbox for Send emails on your behalf.

Additionally, we can uncheck the Copy (Cc) from your Email setting if you're not using it. Here's how to do that:

1. On the same Invoice page, select the Manage online delivery settings to go directly to the Sales within Account and Settings.
2. Scroll the Messages section and remove the checkmark for Email me a copy at (email).
3. Click Done.

However, if you're not utilizing the Gmail address and Copy (Cc) option while this odd behavior happens, access your QuickBooks account using an incognito or private browsing window to determine if the issue is related to the webpage. These are the keyboard shortcuts you can utilize:

• For Firefox, press Ctrl + Shift + P
• For Chrome, press Ctrl + Shift + N
• For Safari, hold down Command + Shift + N

Once there, log in to your QuickBooks account to send the invoice. If it works, I suggest clearing your default browser's cache. Otherwise, utilize other supported browsers as alternatives.

As a workaround, download a PDF of the invoice and then manually send it to the customers via your personal or company email outside QuickBooks.

Moreover, see this article to learn how to register customer settlements: Record invoice payments in QuickBooks Online.

Furthermore, if you need to combine the payments, put them in the Undeposited Funds account. This way, you can group multiple payments into one deposit.

Respond below for further assistance with invoices or sales transactions, or start a new post in the Community. Rest assured that we're willing to assist you. Keep safe.