[Bug 967951] [NEW] The LMTP runner should reject messages with duplicate Message-IDs

[Barry Warsaw]

Public bug reported:

Subject says it all.  Mailman 3 requires unique Message-IDs for posts.

** Affects: mailman
     Importance: Undecided
         Status: New


** Tags: easy mailman3

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https://bugs.launchpad.net/bugs/967951

Title:
  The LMTP runner should reject messages with duplicate Message-IDs

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