I cannot send invoices via email to my customers, I used to be able to do this in previous months but now cannot, I have not changed anything in my profile.

QB Online or QB Desktop?

Let's verify and review undelivered invoices via emails in your QuickBooks Online account, fredsgwen.

In QuickBooks, an email fails to deliver if the email address is incorrect or there's a temporary issue with the recipient's email server. With this, please make sure you associate the correct email address with each of your customer accounts and check the status of the sent invoice. Doing so will ensure they receive their invoices and pay them in real time.

I'll include this guide for more detailed input: Fix undelivered invoices in QuickBooks Online.

In the meantime, you'll want to download your invoices and send them manually through your preferred email service provider. To do this:

1. Go to Sales, then click the Invoice tab.
2. Open an invoice you want to send. 
3. Click the Print or Preview tab on the bottom part of the screen. 
4. Then, click Download. 

Moreover, here's a reference you can utilize whenever your customer pays the invoices sent: Record invoice payments in QuickBooks Online.

I'll keep this thread available so you can always reply to any added queries when managing invoices in your account. Stay safe and have a good one!

I am having the same problem, but with the desktop version.  I have Desktop Pro Plus 2024 and I have just spent 5 hours trying to figure out why I suddenly cannot email my invoices. 

I use Comcast.net for my email. 

My password is correct. 

The SMTP server and port is correct : smtp.comcast.net   and   587. 

Quickbooks is unchecked on the Run this program as Administrator option. 

I have never had this problem before.  Quickbooks did have a big update recently.   I tried emailing an invoice to myself and that didn't work.  I tried emailing an invoice one at a time and that didn't work.

I do not want to download all of my invoices one at a time to send them via comcast directly.  That is insane. 

Help! 

I appreciate your effort in performing the troubleshooting correctly, Green.

Let’s proceed with the repairs to address the unexpected behaviors and common errors when sending invoice emails by downloading and installing the QuickBooks Tool Hub.

Here's how:

1. Close QuickBooks.
2. Download the most recent version (1.6.0.5) of the QuickBooks Tool Hub.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. Once done, double-click the icon on your Windows desktop to open the tool hub.

For more detailed steps, please check out this article: Fix common problems and errors with the QuickBooks Desktop.

If the issue persists, I recommend contacting our Technical Support team to investigate this problem and find an appropriate solution. They have the necessary tools to pull up your account and can do screen-sharing in a secure environment.

Refer to the detailed steps below to reach them:

1. Open QuickBooks.
2. Go to Help, then select QuickBooks Desktop Help/Contact Us.
3. Select Contact Us.
4. Enter a brief description of your issue, then click Continue.
5. Select to chat with us or Have us call you.

In the meantime, you can also utilize other email services like Outlook or Gmail to send these invoices.

Furthermore, you may check this reference to help you process customer payments for invoices: Take and process payments in QuickBooks Desktop.

You can always let us know if you have other questions about email or invoice concerns. We're always here to help in any way we can.