Calendar Invites

Matcha can parse and display calendar invites (.ics attachments) directly in the email view, and lets you RSVP without leaving the terminal.

Features

• 📅 Invite Detection: Automatically detects text/calendar MIME parts and .ics attachments.
• 📋 Event Details Card: Displays a styled card with the event title, date/time, location, and organizer.
• ✅ RSVP Support: Accept, decline, or tentatively accept meeting invites with a single keypress.
• 📧 Standards-Compliant Replies: Sends RFC 6047 (iMIP) compliant RSVP emails with proper METHOD:REPLY and PARTSTAT updates.
• 💾 Cache Persistence: Calendar invite details are preserved when emails are cached for offline viewing.

How It Works

When you open an email containing a calendar invite, Matcha parses the .ics data and renders an event card above the email body:

╔══════════════════════════════════════════╗
║ 📅 Meeting Invite                       ║
║                                         ║
║ Title:     Weekly Standup               ║
║ When:      Mon Apr 20, 2026, 10:00 AM - ║
║            10:30 AM                     ║
║ Where:     Conference Room B            ║
║ Organizer: alice@example.com            ║
║                                         ║
║ Press 1:Accept  2:Decline  3:Tentative  ║
╚══════════════════════════════════════════╝

Keybindings

Key	Action
1	Accept the invite
2	Decline the invite
3	Tentatively accept the invite

These keybindings are only active when a calendar invite is detected in the current email.

RSVP Details

When you press an RSVP key, Matcha:

1. Generates a reply .ics file with your updated attendance status (ACCEPTED, DECLINED, or TENTATIVE).
2. Sends an email to the organizer containing:
   • A plain text body with the event summary and your response.
   • An inline text/calendar; method=REPLY part for calendar clients that process iMIP.
   • An invite.ics file attachment as a fallback.
3. Maintains email threading via In-Reply-To and References headers.

Compatibility

RSVP replies follow the iMIP standard (RFC 6047) and are processed by most calendar systems:

Calendar Provider	RSVP Processing
Microsoft Outlook / Exchange	✅ Fully supported
Apple Calendar / Mail	✅ Fully supported
Mozilla Thunderbird	✅ Fully supported
Google Calendar	⚠️ Limited — Google processes RSVPs through internal APIs rather than parsing incoming iMIP emails. Your reply will arrive as a regular email in the organizer's inbox but may not update your attendance status in Google Calendar.

Supported Formats

Matcha handles calendar invites delivered as:

• text/calendar MIME parts (inline calendar data).
• .ics file attachments (application/ics).
• Both REQUEST (new invite) and CANCEL (cancelled event) methods.

If an .ics file cannot be parsed, it falls back to being shown as a regular attachment.