Remember, blocking doesn't usually "delete" the mail instantly; it just routes it to Junk. You can set Outlook to permanently delete suspected junk instead of moving it.
Use the to remove a sender or the + Add button to manually type in a new one. On Outlook Desktop (Classic) Go to the Home tab. Click Junk in the Delete group. Select Junk E-mail Options . block list outlook
Outlook (specifically the New Outlook and Outlook on the Web) has improved domain blocking, but legacy limitations exist. In older versions, blocking a top-level domain (TLD) like .xyz was difficult. Modern Exchange Admin Centers now allow blocking entire TLDs, which is highly recommended given the prevalence of cheap, malicious TLDs like .top , .xyz , or .club . On Outlook Desktop (Classic) Go to the Home tab