Fighting Spam Calendar Invitations

HIS Zimbra Webmail

• Preferences > Calendar
• Uncheck ""Automatically add received appointments to calendar"
• Save

Outlook (Web/Desktop)

• Settings > Calendar > Events and invitations: Uncheck "Automatically add meeting invitations to my calendar" or "Automatically process meeting requests".
• Check Junk Email Settings: Ensure spam filters are active to prevent unwanted invites from arriving in the first place.

iPhone/Apple Calendar

• Settings > Calendar > Siri & Search: Turn off "Show Siri Suggestions in App".
• Cloud.com: Check settings to block, delete, or hide spam invitations.

For added protection, avoid clicking "Accept" or "Decline" on spam invitations, as this confirms your email address to attackers.