Validate the Fastmail API token by fetching the JMAP session and checking capabilities. Returns 'ok' when mail + submission capabilities are present; otherwise returns missing capabilities.
This tool works seamlessly with the following services
Fastmail is an email provider with a modern standards-based API via JMAP. These tools let you list mailboxes, search and fetch emails, triage messages (read/unread, move), send email via JMAP submission, and manage Fastmail Masked Email addresses.
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