About 1/3 of my "sent invoices" are not sent to my clients. QB always gives the "message sent" confirmation even though that is not the case. I use gmail and can check my sent mail to verify an invoice is sent. There is no consistency with the client. Some are sent some not. I have verified with recipients that they are receiving some but not all of the invoices to the SAME email address. This issue just started this year, nothing has changed on my end, this happens to both new or old clients. I re-sent one of the invoices today and the 3rd attempt worked. Again I did not change a single thing and this has nothing to do with the recipients email address, account, etc. Just a glitch in QB Desktop Pro 2018 that I desperately need to be fixed! I typically use send invoices in batches but not always, no difference, same issues.
I appreciate you for providing a detailed information about your issue with emailing invoices in QuickBooks Desktop.
Let's make sure the invoices are sent to your customers. To check this, you can follow the steps below:
Go to Customers tab.
Click Customer Center.
Choose a customer that you sent an email.
From the Sent Email tab, check if the invoice was successfully sent.
If you confirm that the invoice was successfully sent and your clients are still unable to receive the emailed invoices, you can make sure your customers are receiving import email messages from Intuit. There are some email domains may block @intuit.com communications on their servers. These steps may resolve your issue:
Send an email to firstname.lastname@example.org. This should trigger the email domain to recognize the @intuit domain as a trusted site. Then try your request again.
Wait at least 5 minutes after requesting a new verification code to see if the email appears in your inbox.
If the email does not appear after 10 minutes, please contact your email provider to evaluate security settings for your email profile.