How TLS Delivery occurs
This page describes TLS behavior from a Proofpoint Sender and Recipient point of view.
In both cases below, we do recommend that the filters created be for the recipient
This is the Proofpoint sender's perspective.
Most customers will want to utilize TLS for outbound, to ensure a secure mail transport.
If an outbound filter is created then the condition should be based on the recipient domain (not the Proofpoint customer). The action should be 'Nothing,' and the secondary action can be:
This is the Proofpoint recipient's perspective.
This is to ensure that mail from the Proofpoint environment to the customer's mail server environment is over TLS. By default, we attempt this over TLS to begin with.
If an inbound filter is created then the condition should be based on the recipient (the Proofpoint customer), the action should be 'Nothing' and the secondary action can be: