1) You can refer to WF_NOTIFICATIONS.mail_status column. It should be "SENT" if it has been sent.
3) Please customize the POAPPRV workflow to customization the subject line.
4) Attach the documents to PO headers with category equals "To Supplier" should work. Also, please set the "Max Attachment Size" and "Email Attachment Filename"in Purchasing Options to ensure the attachment can be sent.
Thanks for the response. It is helpful.
1) I have seen the workflow notification status is SENT even when the email address is invalid. What we are trying to achieve is identify any potential errors such as email bounce when an invalid email address is entered or for any other reason and other scenarios such as capturing out of office response from the supplier when the notification is sent from workflow. could you please let me know if you have any suggestions.