Hi there, useraquapluspools.
To batch email all customers in QuickBooks Online, I'd suggest going to the Sales page. From there, you're able to select multiple customers who you want to email.
Here's how:
- Click Sales on the left navigation panel.
- Select Customers at the top.
- Place a check-mark next to the customers that you need to email.
- Click the Batch actions drop-down and choose Email.
For additional information, you can click this article: Email or print multiple invoices and sales forms.
Please refer to this article to see details of how the Sales page gives you a great at-a-glance view of the status of sales transactions, open invoices, and paid invoices: View sales transactions.
Should you need any further assistance, feel free to ask. I'm always here to have your back. Take care!