Forward all emails received in Gmail from a specified sender, to a different email account
I use this recipe with Tasker so that the forwarded messages trigger a custom Task on my android phone. I forward emails from important work contacts to an address that is checked automatically with K9 mail, and Tasker integrates with K9 to run the task and pop up a custom "urgent email" notification. If you're not using Tasker you could still use this. For example: 1) If you don't want to check Gmail for a few days, but you do want to be notified of incoming messages from just one special person. 2) If you need to transfer all messages from just one contact in Gmail to a different account. Maybe messages from your boss or a colleague that you also need to access via your personal email address.