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Is it possible to find out which other domains a user has registered? my company is atm recieving a lot of spam mail and the sender just buys a new domain and keeps spamming, so i wanted to know if i could write a automated script that would check for his domains, or atleast ones in a while look it up and block the domains.

Mathias Rønnow Nørtoft
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It's not possible to search domains from whois database based on owner name or email: the database is only meant for finding contact information for a domain.

The WHOIS system provides information gathered from publicly available information provided by the domain name owner to their individual registrars. - WHOIS.NET

However, SPAM doesn't work that way. You should see the Canonical Question about Fighting Spam.

If you really have one spammer who buys domains in his own name and uses them for sending unsolicited commercial email, legally in his opinion, you could try to block his mail server based on IP address, instead.

Automating whoisdb based filtering would require:

  1. Having an internal database of every domain used on incoming email in order to avoid excessive use of the whoisdb system. Otherwise, you would become the bad guy here.
  2. Creating a custom filter that queries whois example.com every time a new domain name is present and greps for the owner, then flagging the domain as one sending spam.

That would require much more effort than fighting the SPAM with the usual practices.

Esa Jokinen
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You may try with whois, but most registrar allow "anonymous" domain registration (i.e. they don't show the real nic handle of the registrant), Thus chances are you won't get many usefull informations.

Automating this in this case would be even more difficult.

Saïmonn
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