Added the following option to <EventMatchProperty>

```
matchfield attendeesonlydomainlist <DomainNameList>
```

src/GamCommands.txt

@@ -1597,6 +1597,7 @@ gam calendar <CalendarEntity> printacl [todrive <ToDriveAttribute>*]
 
 <EventMatchProperty> ::=
         (matchfield attendees <EmailAddressEntity>)|
+        (matchfield attendeesonlydomainlist <DomainNameList>)|
         (matchfield attendeesdomainlist <DomainNameList>)|
         (matchfield attendeesnotdomainlist <DomainNameList>)|
         (matchfield attendeespattern <RegularExpression>)|

src/GamUpdate.txt

@@ -2,6 +2,16 @@
 
 Merged GAM-Team version
 
+6.72.13
+
+Added the following option to `<EventMatchProperty>` that can be used to select
+events based on the domains of the attendees.
+```
+matchfield attendeesonlydomainlist <DomainNameList>
+```
+This returns true if all attendee's email address are in a domain in `<DomainNameList>`;
+for example this lets you look for events with attendees only in your internal domains.
+
 6.72.12
 
 Added the following options to `<EventMatchProperty>` that can be used to select

src/gam/__init__.py

@@ -36164,6 +36164,7 @@ LIST_EVENTS_SELECT_PROPERTIES = {
 
 LIST_EVENTS_MATCH_FIELDS = {
   'attendees': ['attendees', 'email'],
+  'attendeesonlydomainlist': ['attendees', 'onlydomainlist'],
   'attendeesdomainlist': ['attendees', 'domainlist'],
   'attendeesnotdomainlist': ['attendees', 'notdomainlist'],
   'attendeespattern': ['attendees', 'match'],
@@ -36237,7 +36238,7 @@ def getCalendarEventEntity():
         calendarEventEntity['matches'].append((matchField, getBoolean()))
       elif matchField[0] != 'attendees' or matchField[1] == 'match':
         calendarEventEntity['matches'].append((matchField, getREPattern(re.IGNORECASE)))
-      elif matchField[0] == 'attendees' and matchField[1] in {'domainlist', 'notdomainlist'}:
+      elif matchField[0] == 'attendees' and matchField[1] in {'onlydomainlist', 'domainlist', 'notdomainlist'}:
         calendarEventEntity['matches'].append((matchField, set(getString(Cmd.OB_DOMAIN_NAME_LIST).replace(',', ' ').split())))
       elif matchField[1] == 'email':
         calendarEventEntity['matches'].append((matchField, getNormalizedEmailAddressEntity()))
@@ -36513,6 +36514,12 @@ def _eventMatches(event, match):
       if match[1].search(attendee) is not None:
         return True
     return False
+  if match[0][1] == 'onlydomainlist':
+    for attendee in attendees:
+      _, domain = attendee.lower().split('@', 1)
+      if domain not in match[1]:
+        return False
+    return True
   if match[0][1] == 'domainlist':
     for attendee in attendees:
       _, domain = attendee.lower().split('@', 1)