- testConnection now returns { success, message? } instead of boolean so
admins see the actual EWS/IMAP error in the UI rather than "Unbekannter Fehler"
- Exchange provider: resolveFolder() maps folder string to WellKnownFolderName
(Inbox, SentItems, DeletedItems, Drafts, JunkEmail + German aliases)
- InboxConfigForm: folder field now shown for both IMAP and Exchange protocols
with Exchange-specific help text listing valid well-known names
- Controller returns testConnection result directly (no more redundant wrapping)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
schalli
9b453e3ed3