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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