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Certified Server Validation (CSV) is a technical method of Email authentication intended to fight spam. E-mail authentication is the effort to equip messages of the e-mail transport system with enough verifiable information so that recipients can recognize the nature of each incoming message Spamming is the abuse of electronic messaging systems to indiscriminately send unsolicited bulk messages Its focus is the SMTP HELO-identity of Mail transfer agents. Simple Mail Transfer Protocol ( SMTP) is a De facto standard for electronic mail (e-mail transmissions across the Internet. A mail transfer agent (MTA (also called a mail transport agent, message transfer agent, or smtpd (short for SMTP daemon) is a

CSV was designed to address the problems of MARID and the ASRG, as defined in detail as the intent of Lightweight MTA Authentication Protocol (LMAP) in an expired ASRG draft. MARID was an IETF working group in the applications area tasked to propose standards for E-mail authentication in 2004

As of January 3, 2007, all Internet Drafts have expired and the mailing list has been closed down since there had been no traffic for 6 months. Events 1431 - Joan of Arc is handed over to the Bishop Pierre Cauchon. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Internet Drafts (or I-D s is a series of working documents published by the IETF.


Principles of Operation

CSV considers two questions at the start of each SMTP session:

CSV answers these questions as follows: to validate an SMTP session from an unknown sending SMTP client using CSV, the receiving SMTP server:

  1. Obtains the remote IP address of the TCP connection. Simple Mail Transfer Protocol ( SMTP) is a De facto standard for electronic mail (e-mail transmissions across the Internet. An Internet Protocol ( IP) address is a numerical identification ( Logical address) that is assigned to devices participating in a Computer network The Transmission Control Protocol (TCP is one of the core protocols of the Internet Protocol Suite.
  2. Extracts the domain name from the HELO command sent by the SMTP client. Simple Mail Transfer Protocol ( SMTP) is a De facto standard for electronic mail (e-mail transmissions across the Internet.
  3. Queries DNS to confirm the domain name is authorized for use by the IP (CSA).
  4. Asks a reputable Accreditation Service if it has a good reputation (DNA).
  5. Determines the level of trust to give to the sending SMTP client, based on the results of (3) and (4)

If the level of trust is high enough, process all email from that session in the traditional manner, delivering or forwarding without the need for further validation. If the level of trust is too low, return an error showing the reason for not trusting the sending SMTP client. If the level of trust is in between, document the result in a header in each email delivered or forwarded, and/or perform additional checks.

If the answers to both of the questions at the top of this article are 'Yes', then receivers can expect the email received to be email they want. Mail sources are motivated to make the answers yes, and it's easy for them to do so (unless their email flow is so toxic that no reputable independent accreditation service will vouch for them). CSV is designed to be efficient and elegant, and in this respect it certainly beats SPF's coverage of HELO identities. In Computing, Sender Policy

Client SMTP Authorization (CSA) was a proposedmechanism whereby a domain admin can advertise which mail servers are legitimate originators of mail from his/her domain.

This is done by providing appropriate SRV RRs in the DNS infrastructure. An SRV record or Service record is a category of data in the Internet Domain Name System specifying information on available services

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