The PO E-Mail notification cannot be delivered to the recipients

Summary:

When all buyers create PO's all suppliers can't receive PO email notification and send an email to the buyers as shown in the image below

Hope to get a solution for this issue.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):