research Question

Explanation of SPF and DKIM records

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al4629740Flag for United States of America asked on
Email ServersAntiSpamDNSSecurity
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I am trying to figure out exactly what SPF and DKIM records are used for and in what situations they need to be implemented.  I am familiar with the fact that SPF records help prevent SPAM but how does that exactly work?  Also what are some issues with using these records?  What are the exact differences?  
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