[refactor] Made EmailRelayer responsible for deleting messages and Mailbox responsible for implementing it (20m)
[refactor] Renamed Mailbox#delete to Mailbox#move_to (15m)
[refactor] Rewrote ApiRecipientResolverFactory to match _anything_ recognizable and then ignore hosts that the environment isn't configured to work for (10m)
[improvement] Moved totally unrecognizable emails to a separate folder (20m)
[fix] Stopped trying to parse an empty string (4m)