Checking routing information on e-mail to determine it is in a valid format and contains valid information is an example of which of the following anti-spam approaches?

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Checking routing information on e-mail to determine it is in a valid format and contains valid information is an example of which of the following anti-spam approaches?
A . Simple Mail Transfer Protocol (SMTP) blacklist
B . Reverse Domain Name System (DNS) lookup
C . Hashing algorithm
D . Header analysis

Answer: D