Emails incorrectly going to SPAM folder
I have a friend who's emails go to my SPAM folder about a third of the time. I mark them as Not Spam, but they still periodically go to SPAM. I have to check my SPAM folder every day to make sure an email from her is not there.
I've set up a filter to have anthing from her be sent to my Inbox. That doesn't seem to work.
Is there a way to whitelist her email?