Move the inbound mail list to the CLI

Summary: Same as D6419. See D6413.

Test Plan:
      13  epriestley        D6                    Re: [local/Differential] [Request, 83 lines] D6: aabd
      14  epriestley        D6                    Re: [local/Differential] [Request, 83 lines] D6: aabd
      15  -                 -                     Re: [local/Diffusion] [Commit] rGTEST8fc313c77729: derp
      16  -                 -                     Re: [local/Diffusion] [Commit] rGTEST8fc313c77729: derp
      17  -                 -                     Re: [local/Diffusion] [Commit] rGTEST8fc313c77729: derp
      18  -                 -                     Re: [local/Diffusion] [Commit] rGTEST8fc313c77729: derp
      19  -                 -                     Re: [local/Diffusion] [Commit] rGTEST8fc313c77729: derp
      20  -                 -                     (No subject.)
      21  epriestley        D22                   (No subject.)
      22  epriestley        D12                   (No subject.)

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6420