Your calendar is not advertising space.

Google Calendar: change who gets added

1. Open Calendar on a computer

   Open Google Calendar yourself, then the settings cog and Settings.

2. Find the invitation control

   Under General, choose Event settings, then Add invitations to my calendar.

3. Choose your preferred restriction

   Select Only if the sender is known for a useful starting point. For tighter control, select When I respond to the invitation in email.

4. Review existing junk separately

   The setting applies to new invitations. For an existing unwanted event, use its menu to Report as spam where available. Avoid links or attachments inside the invitation.

Outlook: distinguish two different problems

Meeting invitations: use the invitation’s reporting or junk controls where your version supports them. Update Outlook if those controls are missing. For a managed work account, ask IT about filtering unwanted external invitations. There is no single universal Outlook setting equivalent to Google’s known-sender control.

Events extracted from emails: travel bookings and similar automatic entries are a separate feature. On Outlook on the web, open Settings, then Calendar, then Events from email. Review which event types are added. Turning these off is not a complete block on meeting invitations.

Do you need to decline?

For obvious spam, use report or delete controls and choose not to send a response where offered. A decline may notify the organiser. There is no need to debate with the sender, and reporting is not a guaranteed penalty against their entire domain.

Related guides

• Clear the junk out of Apple Calendar. Remove spam events from your iPhone, iPad or Mac calendar using Apple’s own delete, unsubscribe and Report Junk controls.