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Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses.The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as "MAIL FROM").
Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message.
The simplest method involves spammers purchasing or trading lists of email addresses from other spammers.. Another common method is the use of special software known as "harvesting bots" or "harvesters", which uses spider Web pages, postings on Usenet, mailing list archives, internet forums and other online sources to obtain email addresses from public data.
Even if the SPF and DKIM validation fail, the receiving service can choose to validate the ARC chain. If it indicates that the original message passed the SPF and DKIM checks, and the only modifications were made by intermediaries trusted by the receiving service, the receiving service may choose to accept the email.
The recipient's computer checks whether the e-mail address in the hash string matches any of the valid e-mail addresses registered by the recipient, or matches any of the mailing lists to which the recipient is subscribed. If a match is not found, the hash string is invalid. The recipient's computer inserts the hash string into a database.
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DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [ 1 ]