I sometimes receive emails with .ics file attachments. Mail.app automatically adds these events to my iCloud Calendar as soon as I preview the message.
How can I disable this behaviour and only add the event if I click on the attachment manually?
Why does Mail.app automatically add iCal events from invitations I receive
icalmail.app
Related Solutions
There is an option in Mail.app that you can set to automatically 'Add invitations to iCal'.
In Terminal, type:
defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes
If you want to turn it off again, use
defaults write com.apple.mail DisableInlineAttachmentViewing -bool no
You may need to restart Mail after running this to change the behavior.
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Best Answer
There are web app preferences to manage this in newer macOS.
In the Mail.app go to Preferences->general. There is an option "Add invitations to ICal" which is Automatic or None. You need to choose None.
When you have a mail with date and time in Mail.App will highlight that and clicking on that will add an event to iCal.