420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address

Today I got an error I have never seen before.

420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address

To fix it you need to:

  1. Go to Start, Control Panel, Administrative Tools
  2. Double-click Services
  3. Restart the Microsoft Exchange Transport Service
And all is well.
Author: Harri Jaakkonen

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