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* Import optional mailbox connections lazily in parsedmarc.mail * Fix docstring grammar Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Cover the lazy-import guards with tests and harden the AuthMethod placeholder Maintainer follow-up to the review of #884: - Add tests/test_mail.py: a sys.meta_path blocker simulates installs without the gmail/msgraph stacks, exercising both except branches. CI always has the extras installed, so without a simulated absence the guarded paths would never execute and the blocking codecov patch gate would fail. Includes isolation-safe purge/restore of sys.modules so test ordering cannot leak placeholder state into other suites. - Replace the AuthMethod = None sentinel with a placeholder that raises the msgraph extra's ImportError on non-dunder attribute access, iteration, call, and subscript (every Enum usage shape), instead of surfacing cryptic NoneType AttributeError/TypeError. - Raise a fresh ImportError chained to the stored original in the connection placeholders, so repeated constructions do not keep appending frames to one shared exception object's traceback. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Sean Whalen <44679+seanthegeek@users.noreply.github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>