do u check that spammers make their links like this

blabla1adsdsds1212sasa.domain.com/asasasasasafgdgfgh.html

why they make such a long and stupid subdomains?

often this links redirect to another domain, with a simple url.

imho, doing such a long url-s, the only thing they need is to check is our email valid or no (clicking on this link , they can check it)

correct me, if i'm wrong

They probably make such long subdomains as it is a script doing it so as soon as it is blocked it just randomly generates another random subdomain.

hmm ... yes it's reasonable.

u think that spambots block only subdomains and not domains?

the reason domains look like this is because spammers are setup wildcard dns on their servers, and then have their mailing software generate random urls.
<random>.domain.com/<random>.html

using wildcard dns, anything.domain.com will always point to the same location. This protects them from getting their domains blacklisted by not sending multiple messages with the same url in it.

CyberSpatium