Comment Different option (Score 1) 254
In the email world there are 'reputation' providers that will give an IP address a score (e.g. from 0 to 100). On many domains if your 'reputation' is too low, the email bounces. However we are heading towards an IPv6 world where ip-reputation is too hard (too many addresses). So you need another way to base your reputation on (e.g. your domain name or email address).
Who is providing the content and are they trusted (you better prove you are trustworthy). Just another option.
Who is providing the content and are they trusted (you better prove you are trustworthy). Just another option.