Follow the procedure below to change how often the Mac mail application checks for new emails.
- Open the Mac mail application.
- In the top menu near the Apple logo, click Mail.
- Click Preferences.
- Click the General tab.
- Click the drop-down menu next to "Check for new messages."
- Select the desired frequency.
Optionally, you may manually check for new emails by pressing the "CMD+SHIFT+N" keys.