ydal

See­ing how DNS pre­fet­ching is the new fad with brow­sers, I reckon there’s an easy way to con­firm valid addres­ses of web­mail ser­vice users:

1. Con­trol a DNS to assign uni­que has­hed hostnames.
2. Inte­grate links to has­hed host­na­mes in spam mails.
3. If the reci­pi­ent uses cur­rent Chrome, Fire­fox, etc:
   1. The DNS pre­fet­cher will resolve the host name,
   2. Giving you a con­fir­med hit for the address in your log­files, since your uni­que host­name gets resolved.

Kind of remi­nis­cent of the whole “oh, we can have e-Mails with HTML, let’s put in images!” affair. The only thing that might be a bit of a pro­blem for a spam­mer is get­ting a domain with DNS ser­ver control.

Simple way to use DNS prefetching for spam.