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[Email Database via Digitalmars-d]

SPF is unique in a way because it will actually verify computers 
that are authorized to send emails out for each domain name. 
Computers other than the ones specified are not permitted to send 
emails out to the database of email addresses. The reason for 
this is because the majority of SPAM emails are sent via forged 
email addresses.

When you use this email authentication method, you are telling 
telling the receiver that you are sending authentic emails from 
THIS computer and you are doing your level best to ensure that no 
one abuses the permission that they have given you to communicate 
with them. If unscrupulous people try to tap into your database 
and attempt to spam them, the receiver's email server recognizes 
that it is from a forged email address.Implementing it is easy. 
All you need to do is to log into your web hosting company's 
cPanel and activate Email Authentication.

Reverse DNS means that the server determines the domain name and 
the host when email is received. They check it against the IP 
address to check for authenticity. By default, cPanel would have 
automatically installed the Reverse DNS service for you but it 
won't hurt to double check with the web hosting company that you 
are currently using.
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