Code review comment for lp:~abentley/launchpad/invalid-sig

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= Summary =
Stop handling InvalidSignature as an OOPS, instead handle as user error.

== Proposed fix ==
Implement a new _handle_user_error method, and use it.

== Pre-implementation notes ==
None

== Implementation details ==
Until now, handleIncoming has only had doctests, not unittests.

== Tests ==
bin/test test_incoming -t test_invalid_signature

== Demo and Q/A ==
Send a message with an invalid signature. The resulting error message
should explain what the problem was.

= Launchpad lint =

Checking for conflicts. and issues in doctests and templates.
Running jslint, xmllint, pyflakes, and pylint.
Using normal rules.

Linting changed files:
  lib/canonical/launchpad/mail/incoming.py
  lib/canonical/launchpad/mail/tests/test_incoming.py
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