If you are unsure whether you have blocked a sender, or if you need to retrieve a sender's emails, you can check your blocked list:

If you want to punish a sender by ignoring them completely, use Block . If you want Yahoo to learn what kind of emails you dislike (to train the algorithm) or if you want to review the emails later, use Mark as Spam .

Reporting Spam: Moves the email to your Spam folder. Yahoo uses this data to "learn" what junk looks like, but the emails still exist in your Spam folder for 30 days before being permanently deleted. Can You Recover Blocked Emails?

When you block an email address or domain in Yahoo Mail, future messages from that sender are automatically sent to your — not to a separate "Blocked" folder.