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Hotmail:
Options (Right handside) ► Safe and Blocked Senders ► Blocked Senders
Note: Block domain name, period. [Accidentally blocked vgchartz.com once! LOL!]

Yahoo:
Options ► Mail Options ► Spam ► Blocked Email Address
Note: Max 500 emails

GMail:
Settings ► Filters
Note: Even specify subjects, contents, or attachments