An engineer wants to configure a method to verify the authenticity of emails on cisco ESA and noticed the sender policy framework. How can the SPF help in that task?
A. SPF allows the sender to sign the email using preshare key
B. SPF allows the sender to sign the email using public key cryptography
C. SPF allows the owner of internal domain to use DNS record which machines are authorized to transmit email from that domain.
D. The list of authorized sending hosts for a domain is published in the Domain Name System (DNS) records for that domain in the form of a specially formatted TXT record
Agreed. D is the correct answer.
Ref.: https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_11_1_chapter_010101.html
D