1 · Sign in
Microsoft sign-in uses PKCE (no client secret needed). Scopes requested: User.Read, Mail.Send, Mail.ReadWrite, offline_access.
Not signed in.
3 · Test B — list deferred drafts
Lists Drafts expanded with singleValueExtendedProperties to find the deferred send time. Use Delete to cancel a queued email before its time (Test C).
4 · Test D — scheduling horizon
Queues an email far in the future to document the maximum safe window. Emails are sent to you; check they arrive on the date (or delete them from the list above before then).