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







