How can a producer know whether a file was delivered to a consumer's mailbox?

You can create a rule to alert a producer if a file is delivered to a consumer’s mailbox.

Set up a rule with the following parameters. Substitute an appropriate value for your mailbox location.
Key Operator Value
SI.Mailbox Path Matches /RQ103PGPConsumerE/Inbox
SI.Is Put (true or false) Matches true
Event Type Matches Process Step Ended