MySQL Student <mysqlstud...@gmail.com> wrote: > Some portion of our users are from China. I hoped someone could help > me troubleshoot the best way to permit a user from .cn to forward mail > without improperly being tagged as spam, yet still block the majority > of spam from .cn. > [...]
Have you considered making your MTA (SMTP server) to reject messages from hosts in CN without reverse DNS? [closed loop of addr->PTR->name->A->addr ] Many spam sources in China lack closed RDNS loop. Which MTA server do you use? [exim/postfix/sendmail/...] P.S. There are many services to map IP address to "country of origin" e.g. zz.countries.nerd.dk, origin.asn.cymru.com. -- [pl>en: Andrew] Andrzej Adam Filip : a...@onet.eu If a man had a child who'd gone anti-social, killed perhaps, he'd still tend to protect that child. -- McCoy, "The Ultimate Computer", stardate 4731.3
