recv: Send failure messages on receive failures.

katzenpost / mailproxy

POP/SMTP to Katzenpost proxy server library

GNU Affero General Public License v3.0

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Closed Yawning closed 6 years ago

Yawning commented 6 years ago

The receiver side should send RFC 6522 compliant messages on the following receive failure cases:

Failure to decrypt a block.
Failure to receive the entire message in a timely manner (Timeout optional/user configurable).
Message storage failure (Failed to parse message, Forbidden headers set).