I am thinking , what is the best way to handle the failed emails (not notifications).
Our instance has a custom action to send emails, and whenever an email fails due to invalid recipient, there is no failure message reported to the record/user.
You can have a business rule on sys_email and have it fired when the state of the email log is Sent-Ignored to send an email to person who created it or to what ever person you like to send the notification.
The status of the email notification. Choices are:
received: The server received this email.
received - ignored: The server received this email, but it was ignored by the instance for inbound email action purposes. Typically, these emails are either spam or auto-replies. See the Error String field for details.
send - failed: The server has attempted to send the email and failed. See the Error String field for details.
send - ignored: The server skipped sending this email. Typically, this is for an email which was generated but lacked a recipient email address or is a duplicate email. See the Error String field for details.
send - ready: The email is ready to be sent, but has not been sent out by the mail server. Typically, an email remains in this state for only a short time.
sent: The email was sent by the instance without any errors or issues.
