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SpamTricks
Mailshell defines SpamTricks two ways:
a) Tactics spammers use to reduce the costs of sending
large volumes of mail; and
b) Tactics spammers employ to circumvent spam filters.
Common tricks include uses of image-only messages,
HTML obfuscation, and manipulation using relays, mail formats
and various header analysis including time stamps, header
analysis and SMTP envelope analysis.
SpamTricks also looks for fraudulent spam,
frequently known as 'phishing' whereby messages appear to
be from a known company and attempt to trick users into
revealing personal information.
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