Disable mail.app message "cannot send message"

Hi,
I'm working offline from time to time, but Mail.app keeps generating these annoying messages saying that he "cannot send message" and that "the server cannot be contacted", after trying to send alert messages (generated by Calendar.app)
Well I know that the server cannot be contacted.. that's because I'm not connected, because I don't have an internet connection.
How can I disable these messages when I'm working offline? Quitting the Calendar and Mail.app does not work. Processes are working in the background I suppose. And choosing the "Try Later" option just suppresses the message for a while.
What can I do?
Thanks,
Kris

Open Activity Monitor, located in /Applications/Utilities. Make sure you have All Processes showing in the drop down in the upper right. Locate CalendarAgent (this is likely the one doing it) and Calendar (this one is the actual calendar app, so leave this one if you still want to view your calendars). Select them and click Quit Process in the upper left. That may do the trick. Opening your Calendar will reopen both processes.
If that doesn't help, you may want to repost this. Some users may not look at the thread since it was marked as solved.

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Disable mail.app message "cannot send message"

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