The SG currently rejects all email not associated with a user account or alias. It would be great to have an option that either passes this email to the inside servers or HOLD the undeliverable email to enable the Admin to determine its disposition or change its Recipient email address.

The Default for this option should be the current behavior of rejecting email to invalid recipients and replying to the sender with an Non-delivery 550 email.

This feature is important to us because not all of our customers have 100% typing accuracy when it comes to email addresses. This also enables us to prevent the SG from back scattering non-delivery emails.