You can adjust Gmail Notifier’s mail checking frequency interval by accessing an advanced preference in the application. In this example we will change the email check interval to 3 minutes.
* Click the Gmail Notifier menubar icon
* Hold down Command+Option keys and click on “Preferences” in the drop down menu
* Enter the following information exactly in the Key and Value boxes:
Key: AutocheckInterval
Value: 3
* Note that AutocheckInterval is case-sensitive, the second number value is the minutes between checking.
* Click the “Set” button
* Quit and re-open Gmail Notifier
By default Gmail Notifier does not have a value set for AutocheckInterval, which can lead to extended lengths of time between email checking (hours if you’re away from your computer, and regularly 30+ minutes while at your Mac). You can also just manually adjust this setting by adding the value in a Plist editor.