Do blocked emails get returned to sender?
In some cases, the email may bounce back to the sender with an error message indicating that the email was blocked or rejected. However, in other cases, the email may be silently filtered or discarded without any notification to the sender.
What happens to blocked emails in Outlook?
Messages from addresses or domain names in the Blocked Senders List are always treated as junk. Outlook moves any detected incoming message from senders in the Blocked Senders List to the Junk E-mail folder, regardless of the content of the message.
How do I block emails so they bounce back in Outlook?
Block a sender
The blocked person can still send you mail, but if anything from his or her email address makes it to your email account, it's immediately moved to the Junk Email folder. Future messages from this sender will go to your Junk Email folder or End-User Quarantineif enabled by your administrator.