The protocol used for the delivery of email (SMTP) provides methods for identifying the origins of an email
Spammers will inevitably attempt to "spoof" or otherwise fool these methods
Understanding how spammers attempt to conceal their identity is important in identifying spam and its origins
In fact, some mistakes made by spammers attempting to conceal their identities provide effective methods for filtering spam
Any effective spam leaves some connection to its origin- but some spams are simply an elaborate hoax
Spammers are often very transient- up and gone before you even receive their message!
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