Thanks for reaching out to the QuickBooks Community. Communicating with your customers is super important. I’d be happy to help figure out what’s going on with the emails. Can you give me a little more information about what is happening?
Are all of your customers affected?
What type of emails are you sending? Is it invoices, or something else?
Are they receiving an error message?
This information will help me get a better picture of what’s causing these issues. A screenshot of what happens when they try to open the email would also be helpful. Please comment below with these details so we can get you back on track! Thanks in advance.