# Send initial request
> put a@gmail.com 1qnf39p0m9h6n1cm9qa9d8mocv@google.com
BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
X-LIC-LOCATION:America/Los_Angeles
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20250619T060000
DTEND;TZID=America/Los_Angeles:20250619T064500
RRULE:FREQ=WEEKLY;WKST=SU;COUNT=2;BYDAY=TH
DTSTAMP:20250616T182403Z
ORGANIZER;CN=John Doe:mailto:a@gmail.com
UID:1qnf39p0m9h6n1cm9qa9d8mocv@google.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
 TRUE;CN=b@gmail.com;X-NUM-GUESTS=0:mailto:b@gmail.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE
 ;CN=John Doe;X-NUM-GUESTS=0:mailto:a@gmail.com
X-MICROSOFT-CDO-OWNERAPPTID:299828133
CREATED:20250616T182358Z
LAST-MODIFIED:20250616T182358Z
LOCATION:
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Meet me maybe
DESCRIPTION:This is the event description
TRANSP:OPAQUE
BEGIN:VALARM
ACTION:DISPLAY
DESCRIPTION:This is an event reminder
TRIGGER:-P0DT0H10M0S
END:VALARM
END:VEVENT
END:VCALENDAR

> expect
from: a@gmail.com
to: b@gmail.com
summary: invite
summary.attendee: Participants([ItipParticipant { email: "a@gmail.com", name: Some("John Doe"), is_organizer: true }, ItipParticipant { email: "b@gmail.com", name: Some("b@gmail.com"), is_organizer: false }])
summary.description: Text("This is the event description")
summary.dtstart: Time(ItipTime { start: 1750338000, tz_id: 148 })
summary.rrule: Rrule(ICalendarRecurrenceRule { freq: Weekly, until: None, count: Some(2), interval: None, bysecond: [], byminute: [], byhour: [], byday: [ICalendarDay { ordwk: None, weekday: Thursday }], bymonthday: [], byyearday: [], byweekno: [], bymonth: [], bysetpos: [], wkst: Some(Sunday) })
summary.summary: Text("Meet me maybe")
BEGIN:VCALENDAR
METHOD:REQUEST
PRODID:-//Stalwart Labs LLC//Stalwart Server//EN
VERSION:2.0
BEGIN:VEVENT
DESCRIPTION:This is the event description
LOCATION:
STATUS:CONFIRMED
SUMMARY:Meet me maybe
DTEND;TZID=America/Los_Angeles:20250619T064500
DTSTART;TZID=America/Los_Angeles:20250619T060000
TRANSP:OPAQUE
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
 TRUE;CN=b@gmail.com;X-NUM-GUESTS=0:mailto:b@gmail.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE;
 CN="John Doe";X-NUM-GUESTS=0:mailto:a@gmail.com
ORGANIZER;CN="John Doe":mailto:a@gmail.com
UID:1qnf39p0m9h6n1cm9qa9d8mocv@google.com
RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH;WKST=SU
CREATED:20250616T182358Z
DTSTAMP:0
LAST-MODIFIED:20250616T182358Z
SEQUENCE:1
X-MICROSOFT-CDO-OWNERAPPTID:299828133
BEGIN:VALARM
DESCRIPTION:This is an event reminder
ACTION:DISPLAY
TRIGGER:-PT10M
END:VALARM
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
X-LIC-LOCATION:America/Los_Angeles
BEGIN:DAYLIGHT
DTSTART:19700308T020000
TZNAME:PDT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19701101T020000
TZNAME:PST
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
END:STANDARD
END:VTIMEZONE
END:VCALENDAR

# Send iTIP
> send

# Update the event, expect no changes
> put a@gmail.com 1qnf39p0m9h6n1cm9qa9d8mocv@google.com
BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
X-LIC-LOCATION:America/Los_Angeles
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20250619T060000
DTEND;TZID=America/Los_Angeles:20250619T064500
RRULE:FREQ=WEEKLY;WKST=SU;COUNT=2;BYDAY=TH
DTSTAMP:20250616T182416Z
ORGANIZER;CN=John Doe:mailto:a@gmail.com
UID:1qnf39p0m9h6n1cm9qa9d8mocv@google.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
 TRUE;CN=b@gmail.com;X-NUM-GUESTS=0:mailto:b@gmail.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE
 ;CN=John Doe;X-NUM-GUESTS=0:mailto:a@gmail.com
X-MICROSOFT-CDO-OWNERAPPTID:299828133
CREATED:20250616T182358Z
LAST-MODIFIED:20250616T182415Z
LOCATION:
SEQUENCE:1
STATUS:CONFIRMED
SUMMARY:Meet me maybe
DESCRIPTION:This is the updated event description
TRANSP:OPAQUE
BEGIN:VALARM
ACTION:DISPLAY
DESCRIPTION:This is an event reminder
TRIGGER:-P0DT0H10M0S
END:VALARM
END:VEVENT
END:VCALENDAR

> expect
from: a@gmail.com
to: b@gmail.com
summary: update REQUEST
summary.attendee: Participants([ItipParticipant { email: "a@gmail.com", name: Some("John Doe"), is_organizer: true }, ItipParticipant { email: "b@gmail.com", name: Some("b@gmail.com"), is_organizer: false }])
summary.description: Text("This is the updated event description")
summary.dtstart: Time(ItipTime { start: 1750338000, tz_id: 148 })
summary.rrule: Rrule(ICalendarRecurrenceRule { freq: Weekly, until: None, count: Some(2), interval: None, bysecond: [], byminute: [], byhour: [], byday: [ICalendarDay { ordwk: None, weekday: Thursday }], bymonthday: [], byyearday: [], byweekno: [], bymonth: [], bysetpos: [], wkst: Some(Sunday) })
summary.summary: Text("Meet me maybe")
~summary.description: Text("This is the event description")
BEGIN:VCALENDAR
METHOD:REQUEST
PRODID:-//Stalwart Labs LLC//Stalwart Server//EN
VERSION:2.0
BEGIN:VEVENT
DESCRIPTION:This is the updated event description
LOCATION:
STATUS:CONFIRMED
SUMMARY:Meet me maybe
DTEND;TZID=America/Los_Angeles:20250619T064500
DTSTART;TZID=America/Los_Angeles:20250619T060000
TRANSP:OPAQUE
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
 TRUE;CN=b@gmail.com;X-NUM-GUESTS=0:mailto:b@gmail.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE;
 CN="John Doe";X-NUM-GUESTS=0:mailto:a@gmail.com
ORGANIZER;CN="John Doe":mailto:a@gmail.com
UID:1qnf39p0m9h6n1cm9qa9d8mocv@google.com
RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH;WKST=SU
CREATED:20250616T182358Z
DTSTAMP:0
LAST-MODIFIED:20250616T182415Z
SEQUENCE:1
X-MICROSOFT-CDO-OWNERAPPTID:299828133
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
X-LIC-LOCATION:America/Los_Angeles
BEGIN:DAYLIGHT
DTSTART:19700308T020000
TZNAME:PDT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19701101T020000
TZNAME:PST
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
END:STANDARD
END:VTIMEZONE
END:VCALENDAR

> send

# Make sure the original alarms are preserved
> get b@gmail.com 1qnf39p0m9h6n1cm9qa9d8mocv@google.com
BEGIN:VCALENDAR
PRODID:-//Stalwart Labs LLC//Stalwart Server//EN
VERSION:2.0
BEGIN:VEVENT
DESCRIPTION:This is the updated event description
LOCATION:
STATUS:CONFIRMED
SUMMARY:Meet me maybe
DTEND;TZID=America/Los_Angeles:20250619T064500
DTSTART;TZID=America/Los_Angeles:20250619T060000
TRANSP:OPAQUE
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=
 TRUE;CN=b@gmail.com;X-NUM-GUESTS=0:mailto:b@gmail.com
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;RSVP=TRUE;
 CN="John Doe";X-NUM-GUESTS=0:mailto:a@gmail.com
ORGANIZER;CN="John Doe":mailto:a@gmail.com
UID:1qnf39p0m9h6n1cm9qa9d8mocv@google.com
RRULE:FREQ=WEEKLY;COUNT=2;BYDAY=TH;WKST=SU
CREATED:20250616T182358Z
DTSTAMP:0
LAST-MODIFIED:20250616T182358Z
SEQUENCE:1
X-MICROSOFT-CDO-OWNERAPPTID:299828133
BEGIN:VALARM
DESCRIPTION:This is an event reminder
ACTION:DISPLAY
TRIGGER:-PT10M
END:VALARM
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
X-LIC-LOCATION:America/Los_Angeles
BEGIN:DAYLIGHT
DTSTART:19700308T020000
TZNAME:PDT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19701101T020000
TZNAME:PST
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
END:STANDARD
END:VTIMEZONE
END:VCALENDAR



