Milter-greylist

> Cheking for sender domain registration age would be an interesting
> feature in milter-greylist, unfortunately the information is scattered
> in vraious Whois registries with different formats, so it seems a job
> for a scripting language. If someone has ideas on how to implement that
> reliabily, I am interested.
> 

I think this should be done via simple DNS query.
An example: if you are interested in the registration date of example.com
you do a TXT query of example.com.domainage.org an that returns
its registration date in a standard format.

The script you mentioned should just populate the domain domainage.org.

I do not know is there any such service already existing?

If not, may be I am the first having this idea?

Best,
Attila