I have it set so that when I send an invoice, I get a copy sent to me. I also set up a Smart Mailbox for them. For some reason back in April, they stopped arriving.

Hi @galvanicmac  , thank you for asking in quickbooks community. Have you checked the email address in recurring transaction? If not yet, you could follow these steps: 

1. Click the Gear icon. 
2. Choose Recurring Transactions. 
3. Open the Recurring invoice, and check under Email if the email enter. (You could thick automatically send emails beside Email).
4. Tap Save template if modify made.

Then check your email, did it sent?

You could check your email account too. I'll provide the articles relates to your problem.

- Edit recurring 

- Manage recurring 

- Recurring transaction doesn't send automatically 

Comment back for every assistance. Cheers.

I appreciate your time reaching out to us, galvanicmac.

If you have the correct email address and the Email me a copy is enabled in the settings, let's make sure to check your junk or spam folder. Some email providers are tracking down spam emails, which sometimes legit emails go to that folder too. 

In QuickBooks Online, you can run the Audit Log report to see the activities of the sent invoices.

Here's how:

1. Go to the Gear > Audit Log.
2. Select the Filter drop-down, and select the User, Date and put a check mark on the Transactions box under Events.
3. Click Apply.
4. Under the EVENT column, you will see the Emailed status.
5. Click the View link to see the history of the transaction and check the email address.

For more information about the audit log, check out this article: Use the audit log in QuickBooks Online.

Alternatively, try to send a sample invoice and check if you receive it. If you’re getting the same result, you’ll want to use a different email address.

Please let me know if there's anything else you need. I'm just a post away to help you some more. 

Hi @galvanicmac  , thank you for asking in quickbooks community. Have you checked the email address in recurring transaction? If not yet, you could follow these steps: 

1. Click the Gear icon. 
2. Choose Recurring Transactions. 
3. Open the Recurring invoice, and check under Email if the email enter. (You could thick automatically send emails beside Email).
4. Tap Save template if modify made.

Then check your email, did it sent?

You could check your email account too. I'll provide the articles relates to your problem.

- Edit a recurring template 

- Manage recurring 

- Recurring transaction doesn't send automatically 

Comment back for every assistance. Cheers.

Thanks, but the nature of my consulting practice doesn't, at this point anyway, have any recurring transactions. I hope to in the future! All of my invoices are just straight billing for my time at my rate per hour with detail of what I did, etc. or sales receipts with same, when they paid at time of service.

This audit log has the same problem that the warnings I would get sometimes in my QBO dashboard. I would send an invoice to two or three addressees (one or two for the client and a cc or bcc to myself) and I would get an notice that is "Undelivered" but it didn't tell me which addressee was undelivered. Then I would see that the customer had viewed the invoice, and then PAID the invoice, so I had assumed that the warning was a false alarm. This went on for a few months and I even submitted a ticket about these "false alarms" in my dashboard, until I realized around May or June that I had not been receiving my copies coming back to a special mailbox that I had set up for my copies since January? Only the special test messages I had sent to my fictitious customer or times that I had manually inserted my personal email in place of the customer's email address did I receive a copy in my Smart mailbox set up to receive my invoice copies.

Thank you for alerting us about this matter, galvanicmac.

Let me share some insights regarding the Audit Log. If you use multiple email addresses when sending transactions, it won't specify to which email is undelivered. You'll want to resend them one by one to identify a faulty email address. From there, you can see the reason why it's undelivered when you open the transaction.

On the other hand, let's also try to configure the server to accept QuickBooks Online mail server hostnames and IP addresses to see if you can get a copy of your sent customer's invoices. To get the list of Host Names, please refer to this article and go directly to Solution 3: 3 solutions for when customers aren't receiving your emails

If you're still unable to get a copy of the invoices, I highly recommend contacting our Customer Care Support Team. They have the necessary tools to do a screen-share and troubleshoot the issue for you. Here's a link on how you can contact them: Contact the QuickBooks Online Customer Support team

I'd appreciate it if you'd update me on how the steps work and how the call goes. I want to make sure this is taken care of.

To my knowledge, my customers are receiving my invoices. I want to use this smart folder that gathers in one place all the copies sent to me as a way of quickly checking at a glance who I have and have not invoiced, without even having to login to QBO. It will be evident in my email program. 
Regarding your second suggestion. I have already had two calls with support, the second of which, last week involved a screen share and they were stumped. But they did say this is something that the engineering team is working on and they linked my case number to that project. Apparently, I'm not the only one experiencing this problem. Hopefully with my case linked, when they find a solution, I'll be notified.