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The branch 3.X of GNU mailutils fixed the following deficiences found in versions 2.X:

  • Provide a consistent and effective interface for stream I/O.
  • Reorganize the codebase to use streams API, thereby improving performance.
  • Rewrite the filter API to improve its performance and to allow for easy creation and chaining of filters.
  • Improve logging and debugging support.
  • Provide API for word splitting and variable substitution instead of the obsolete argcv module.
  • Rewrite the client support for IMAP4.
  • Provide an extensive testsuite for Mailutils API as well as for the particular applications (in 2.X, the testcases were based on DejaGNU and were mostly non-portable).