My economics teacher likes to use online resources for her course, and this means that she often has us go onto her blogs to post our assignments or do online discussions.
Recently, she created a new blog for us to post our assignments, and told us that she had sent invitations to the blog to all of us. However, when I got home, I couldn't find her invitation email anywhere— including the spam box— so I sent an email to her, asking her to resend the invitation.
Then, after two days, I still didn't get her reply— which was strange, considering that she usually checks her email every day. So I sent another email to her, asking her to just add my username to her blog.
Ten minutes after, I somehow noticed that I have an email folder named "BG," where all emails containing the word "blog" would be redirected to. And guess what? The two emails from my teacher— as well as 7-8 other emails that I mysteriously didn't receive a few months/years ago— were all there.
So I have learned my lesson— never use email filters, for they can cause a lot of trouble. I now recall from grade 10 that there was once when my classmate couldn't get any email from me and we had to create a shared email account so that we could send each other our information on a history project. And the culprit of the inconvenience was, obviously, email filters. This, along with what my email filter has done to me, clearly proves that email filters are evil and disastrous.