Thanks for sharing more details with us, @rob-wilde.
If they haven't received the email notifications yet by using the server hostname through the article. It might be caused by the following interferences below:
- The email was moved to their Junk or Spam folder.
- They use a custom email domain (example: [email address removed]) or an email client (Outlook, Exchange, AOL, Thunderbird, etc.).
- Their internet service or domain provider blocks the QuickBooks email address.
They must follow these steps so that they can receive the emails you've sent.
- Open your email and check your Spam or Junk folder.
- If it’s there, move the email to your Inbox.
If the issue persists, I'd suggest contacting your IT person or domain provider for assistance to temporarily turn off Sender ID filtering or get help on what’s causing they are unable to receive the email.
I'll respond to you as fast as I can if you need further assistance. I'd be happy to help. Have a great weekend!
