How to stop customers from receiving multiple duplicate emails of invoices?

We've reported this issue to our engineers for those users using the Canada and International versions, morrismd1.

Our Technical Team is currently investigating the root cause of this issue, to fix it as soon as they can. While a resolution is not yet available at this time, you may want to call us. We'll add you to the list of the affected users, so you'll be notified when there's an update on this issue.

Here's how to get our contact number:

1. Go to this link https://help.quickbooks.intuit.com/en_CA/contact.
2. Select QuickBooks Online.
3. Click the Contact QuickBooks Online Support topic and get the phone number.
4. To reach out to our international support, change the region in the upper right-hand corner. Since they don't have a phone support, you can send an email instead. They'll get back to you within 24-48 hours.
5. In the Please select your country window, choose your region. If it's not in the options, select International below the All other countries section.
6. Select QuickBooks Online.
7. Click the Managing Your Money topic, and then choose Invoicing & Sales Receipts sub-topic.
8. Scroll down and click the Send Email button.

If you're using the US version, you can check the Invoice List report before emailing the invoices to your customers. This way, you'll know if they were already sent or not, to stop the duplicates.

Here's how:

1. Click Reports on the left panel.
2. Type Invoice List in the search box.
3. Click the Customize button in the upper right-hand corner.
4. Maximize the Rows/Columns section, and then click the Change columns link.
5. Check the box for Sent.
6. Click Run report.

Please keep me posted if you need anything else. Thanks.

I use QuickBooks Pro Desktop 2021 and I am having that same issue with invoices being sent in duplicate. QuickBooks sends the emails to Outlook and Outlook sends the emails to clients. I also have an issue where the emails aren't sent until I actually open Outlook. I do not have recurring or memorized invoices setup as it's not needed. How can this be fixed?

This issue has cased considerable friction between potential and current customers. It also appears to be an ongoing issue with no apparent resolution? 

Hello responding here to see if anyone found a solution for this problem in QB Online.

For the past several months QB Online suddenly began sending duplicate invoice payment emails to my clients. The alerts cc our AP email address so I always get what the client gets. The symptoms seem to be random and are beginning to get frustrating as our clients feel like we're over-bugging them for money. 

Here are some scenarios from just this past week. 

1. I sent the same client A three new invoices. 1 of them showed up twice and 2 showed up only once. 

2. I manually sent client B and client C each a reminder invoice. Client B saw a duplicate invoice alert and Client C did not. 

3. QB sent automatic invoice reminders to Client D for four invoices. 3 invoices were sent twice. 1 was sent once. 

Things I've tried: 

• Checked invoice reminder settings. I previously had "send an automatic reminder" 3 days before and 3 days after invoice due date. I deleted the one 3 days after and instead of sending 3 invoice reminders at once it sends 1 or 2 which applies to the scenario above. If this is actually the problem, I haven't decided whether I want to make the tradeoff with automatic reminders.
• I've checked "recurring transactions". No clients are on this list. 
• I've checked the QB invoice email settings as my own email and AP email were both cc'd on invoices. I removed my own email to see if it made a difference which it shouldn't and it didn't. 
• Other people who are on the AP email address also see the same symptoms. 

4 out of 5 times QB support has essentially said "we don't know" or "there is no way to do that" so I'm hoping the community has new insight. Thanks in advance.