Hi @targetmedia,
Emails are only sent when the donation has been marked as “Complete”.
Can you double-check if the donations are in fact “Complete”?
If the donations are complete, then you need to troubleshoot for email deliverability issues.
Email deliver-ability from your website is sort of out of our control here. However, we have this article that can help you: https://givewp.com/documentation/core/frequent-troubleshooting-issues/troubleshooting-common-email-problems/
My first suggestion is to walk through that doc to check on potential issues with your email settings.
If the email is not coming through there might be an issue with email deliverability in general — that is controlled by your host. Usually, email deliverability issues can be solved via using SMTP instead of the default PHP mail function that is provided by WordPress out of the box.
Please see the “Sending Email from your WordPress Site via SMTP” section in the link above^^^ for more info.