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Change Google Gmail Notifier check interval

You can adjust the interval by clicking on the mail icon and then holding down the Command and Option keys while clicking on Preferences. This will pop open a box for a key/value pair. Use AutocheckInterval as the key (case-sensitive) and then set the interval (in minutes) for it to check as the value.

It was really bugging me how even when I checked my mail the little GMail envelope stayed red for 10 minutes. Problem solved.