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What each provider supports
What an agent can do depends on the provider behind each account. This table is generated from the same registry the gateway enforces: a tool for something marked ✗ answers PROVIDER_UNSUPPORTED for that account, except online-meeting links and attendees’ free/busy, where the call still runs and a warning names what was left out. Reads across accounts cover the accounts that can do it; an account you name with account_id that cannot do it answers PROVIDER_UNSUPPORTED.
✓ the provider does it · ~ Prubex does it on top of the provider · ✗ not available (the tool answers PROVIDER_UNSUPPORTED; for online-meeting links and attendees’ free/busy the call still runs and a warning names what was left out)
| Microsoft 365 and Outlook.com | Gmail and Google Calendar | Zoho Mail and Calendar | Fastmail | IMAP / SMTP and CalDAV | ICS calendar feed | |
|---|---|---|---|---|---|---|
| Read mail | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Search mail | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Conversations | ✓ | ✓ | ✓ | ✓ | ~ | ✗ |
| Folders | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Drafts | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Send, reply and forward | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Flag, label, move and trash | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| See what changed | ✓ | ✓ | ~ | ✓ | ~ | ✗ |
| Read calendars | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Create and change events | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Answer invitations | ✓ | ✓ | ✗ | ~ | ~ | ✗ |
| Propose a new time | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Free/busy | ✓ | ✓ | ✓ | ~ | ~ | ~ |
| Attendees’ free/busy | ✓ | ✓ | ✓ | ✗ | ✗ | ✗ |
| Online-meeting links | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ |
Microsoft 365 and Outlook.com
- Folders: Categories also appear as labels.
- Free/busy: Work accounts use the scheduling service; personal accounts are computed from the calendar.
- Attendees’ free/busy: Work and school accounts only (the scheduling service); personal accounts see their own.
- Online-meeting links: Teams links on work and school accounts only.
Gmail and Google Calendar
- Folders: Gmail labels appear as folders.
- Send, reply and forward: Forwards carry the original’s attachments, within Gmail’s 25 MB per message.
- Attendees’ free/busy: Where Google shares it (usually the same Workspace), and only if the person allowed it when connecting.
Zoho Mail and Calendar
- Drafts: Editing or sending a saved draft saves or sends it anew (Zoho has no draft edit).
- Send, reply and forward: Forwards are composed by Prubex with the original’s text and files, within the account’s limit.
- See what changed: New mail since the last look; Zoho reports no flag changes or moves.
- Answer invitations: Zoho Calendar offers no way to answer an invitation through its API.
- Attendees’ free/busy: People Zoho can see (usually your organisation); Zoho answers the same for someone free as for someone it cannot see.
Fastmail
- Drafts: Editing a draft saves a new one in its place.
- Flag, label, move and trash: Labels are single lower-case words (JMAP keywords).
- Read calendars: Calendars need the optional app password when connecting.
- Answer invitations: Fastmail sends the reply itself; a comment cannot be carried over CalDAV.
- Free/busy: Computed from the account’s own calendars.
IMAP / SMTP and CalDAV
- Conversations: Threads are rebuilt from References and In-Reply-To headers.
- Send, reply and forward: Sent over SMTP, with a copy saved to Sent.
- Flag, label, move and trash: Moves need a server with MOVE; labels are single words (IMAP keywords).
- See what changed: New mail since the last look, and flag changes where the server reports them.
- Read calendars: Where the provider offers CalDAV (iCloud, Yahoo, Fastmail, many hosts).
- Answer invitations: Only where the server sends the reply itself (CalDAV scheduling); without a comment.
- Free/busy: Computed from the account’s own calendars.