Calendar Invite Spam

[mcesari]

Some users have been complaining about getting spam calendar invites

I figured that there would be an easy way to make a filter to discard invites that are not from our domain, but I does not seem to be that strait forward.

The only way I can see is to discard messages with the body contains Content-Type: application/ics and From does not contain domain.com

Anyone have any better ideas?
I havent tried that filter either so I dont know if it will work correctly.
Thanks

[greenrenault]

Seems that Calendar spam is becoming an increasing problem, read this blog post.
9 a.m.: Don't forget to read annoying spam! - The Red Tape Chronicles - MSNBC.com

I believe Zimbra is also prone to this exploit, whereby iCal attachments and calendar invites are automatically accepted and added to the users' Calendar. See this bug:
Bug 17768 - Receving a message with an invite attachment places the appointment in the user calendar

Can anyone confirm that Calendar spam will be a problem for Zimbra too?

[mcesari]

If you filter Content-Type: application/ics to discard you will not get the appointment spam. Of course you will not get any appointments unless you say except from whoever.
But if you just move the message to junk or even trash the appointment will be in your calendar. Even after you delete the message. At least thats what I see with my testing of Zimbra and Google Calendar invites