Generate a bounce message for an undeliverable email message.
| Parameters | message | The undeliverable message. (type: bytes) |
| failedFrom | The originator of the undeliverable message. (type: bytes) |
| failedTo | The destination of the undeliverable message. (type: bytes) |
| transcript | An error message to include in the bounce message. (type: bytes) |
| Returns | The originator, the destination and the contents of the bounce message.
The destination of the bounce message is the originator of the
undeliverable message. (type: 3-tuple
of (1) bytes,
(2) bytes,
(3) bytes) |