Invoices not delivering to the clients

Glad to see you here in the Community, @amruth.

I'm here to help you get this working.

Let's perform a few steps so the client will receive the invoices. To start, have them check if it was sent to their junk or spam folder. If the invoice is still missing, you'll have to configure your email setup.

Here's how:

1. Go to the Gear icon.
2. Under Your Company, select Account and settings.
3. Click the Company tab.
4. Select the edit pencil icon for Contact info.
5. Clear the Company email address field and enter the desired address, even if it shows as the correct one. Make sure not to use any extra characters or spaces before, within, or after the address, you enter.
6. Click Save, and then Done.

Next, send yourself a test transaction to test it. If you’re getting the same result, you’ll have to use a different email address that has a different domain. If the same thing happens, I'd suggest contacting an IT professional. They can help you add QuickBooks Online mail server hostnames and IP addresses to your outgoing mail servers.

Here's an article that lists the Host Name and IP Address: Sales transactions and emailed reports are not being sent.

You can also check this link to see the different information about setting up invoices to send from your Gmail address: Send invoices from your Gmail address FAQ.

Reach out to me if you need more help with any of the steps. I'll be right here to assist you further.