| Publisher | Sophos | ||
|---|---|---|---|
| Format | 116.4KB PDF, requires Acrobat Rdr 5 | Date added | 01 Mar 2004 |
| Topics | Email, Spam and E-mail Marketing | ||
| Downloads | 476 | ||
A standard email non-delivery report (NDR) can simply be faked by a spammer to mislead the recipient into opening it, believing that it is genuine, and subsequently opening an attachment that is spam. To make the NDR look more genuine, the spammer can send an email containing the attachment to a non-existent address at a server that is known to send NDRs, inserting the target recipient's email address in the "From" field. Adaptive filters are unlikely to be fooled by this and can analyze the content of the attachment in relation to the NDR to determine a spam probability.
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