Has anyone had an issue with emails not delivering recently

It’s our priority that you can send emails to all your customers smoothly in QuickBooks Online (QBO).

You may want to ask your customer to check their junk mail and spam folders. If the emailed invoices or sales forms are not there, we'll need to remove and re-enter your email address to refresh the delivery option. Here’s how:

1. Go to the Gear icon in the upper right and select Account and settings under Your Company.
2. Tap the Company menu on the left panel and click the Pencil icon for Contact info to update the information.
3. In the Company email field, clear the email address and enter the desired address as is, even if it appears correct.
4. Make sure not to use any extra characters or spaces before, within, or after the address you enter.
5. Click Save and press Done.

Once done, send a test email. If you continue to get the same result, use another email with a different domain.

If none of these suggestions work, configure the server to accept QBO mail server hostnames and IP addresses. Follow the steps in the Solution 3 section of this article: 3 solutions for you when customers aren't receiving your emails.

Moreover, you can check out this article to help you resolve when you’re having issues sending invoices or estimates to your customers: Delivery Errors when trying to email a sales form.

The Community is always available if you have other questions or concerns about emailing sales forms or any QuickBooks-related. You have a good one.