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30 Aug 15
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08 May 15
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Common Types of E-Mail Abuse where the Sender Address is Forged
Spammers want to avoid receiving non-delivery notifications (bounces) to their real addresses.
Fraudsters want to cover their tracks and remain anonymous.
Computer worms want to cause confusion or just don’t care about which sender addresses they use.
Phishers (password fishers) want to impersonate well-known, trusted identities in order to steal passwords from users.
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Sender Addresses in E-Mails
Like paper mail letters, e-mail messages have at least two kinds of sender addresses: one on the envelope and one in the letterhead.
The envelope sender address (sometimes also called the return-path) is used during the transport of the message from mail server to mail server, e.g. to return the message to the sender in the case of a delivery failure. It is usually not displayed to the user by mail programs.
The header sender address of an e-mail message is contained in the "From" or "Sender" header and is what is displayed to the user by mail programs. Generally, mail servers do not care about the header sender address when delivering a message.
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26 Jan 15
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14 Jan 14
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protects the envelope sender address
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21 Mar 12
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ant to avoid receiving non-delivery notifications (bounces) to their real addresses.
Fraudsters want to cover
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