#105 Adding of trusted sender deals poorly with malformed address

[Don]

The trusted sender options include the setting "Trust senders of revoked emails." but the system that lifts the address upon revocation seems not to deal well with addressed that are marginally out of RFC 2822.

While this is understandable, it's confusing as a user to mark a message "not spam" and have it repeatedly be re-classified as spam. Additionally I'm unsure if doing so will screw up the other learning mechanisms through repeated submission.

The message I detected this on had the following sender line:

From: "Labelcity Hot Deals" hd@labelcity.com