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Fixes #1351 - Add shared mailbox alias limitation to M365 Graph accounts - #1355

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@ralf401 ralf401 commented Oct 22, 2026

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Claim -> source anchor:

  • Zammad sends shared mailbox email with delegated access: app/models/channel/driver/microsoft_graph_outbound.rb:33 (mailbox = shared_mailbox, token of the authenticated user) and lib/microsoft_graph.rb:14-18,214 (POST users//sendMail, raw MIME).
  • Microsoft doesn't support send from alias for shared mailboxes outside OWA "Open another mailbox": known issues of "Sending From Email Aliases - General Availability" (Exchange Team Blog, Oct 2026).
  • Workaround (separate shared mailbox per address): same post names shared mailboxes as the alias workaround; Zammad supports multiple accounts.

Claim -> source anchor:
- Zammad sends shared mailbox email with delegated access:
  app/models/channel/driver/microsoft_graph_outbound.rb:33 (mailbox =
  shared_mailbox, token of the authenticated user) and
  lib/microsoft_graph.rb:14-18,214 (POST users/<mailbox>/sendMail, raw MIME).
- Microsoft doesn't support send from alias for shared mailboxes outside
  OWA "Open another mailbox": known issues of "Sending From Email Aliases -
  General Availability" (Exchange Team Blog, Oct 2026).
- Workaround (separate shared mailbox per address): same post names shared
  mailboxes as the alias workaround; Zammad supports multiple accounts.
@ralf401 ralf401 self-assigned this Oct 22, 2026
@ralf401 ralf401 linked an issue Oct 22, 2026 that may be closed by this pull request
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@ralf401 ralf401 changed the title Fixes #1351 - add shared mailbox alias limitation to M365 Graph accounts Fixes #1351 - Add shared mailbox alias limitation to M365 Graph accounts Oct 22, 2026
@ralf401

ralf401 commented Oct 22, 2026

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I put this on hold, FYI @fliebe92 @MrCybertux

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M365 Graph: Aliasses for shared mailboxes don't work

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