Email fraud is one of the biggest threat in the Internet world. To combat this, email authentication standards known as Domainkeys/DKIM were developed. DKIM allows an organization to generate cryptographic signatures on outgoing email to certify the origin of a message as coming from an authorized server for that domain and the integrity of email contents, which consequently is very useful for anti-phishing.
As Domainkeys/DKIM becomes more widely deployed, particularly in webmail services, financial sectors and e-commerce firms, if your domain has no DKIM implemented, outbounce emails from your domain are likely be flagged as spam or junk mail by the email servers which have Domainkeys/DKIM enabled (such as Hotmail, Yahoo mail and Gmail).
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