SPAMfighter has partnered up with Microsoft to build the strongest, safest, and most effective anti spam filter on the market. If you don't use Outlook, or your version isn't supported by the Report Message add-in, you can forward a phishing or spam email to Microsoft. Is there a way to block it on the phone? Outlook Web App: Blocking senders of junk email Messages received from any email address or domain listed in your blocked senders list are sent directly to your Junk Email folder. Basically this extension allows you to easily move emails to the trash based on sender, domain, subject or a word/phrase by clicking on a “Block” button next to Delete. Typically you can drag the email directly to the desktop (Outlook has this capability) or you can right click the email in your email client and “Save as” the email ( for example, Thunderbird). How to stop spam emails outlook app Add a sender or domain to the blocked senders list how to mark and block junk mail or a spam email on the Microsoft Outlook website.