Pages Tagged “SPF”
Blog Posts
- SubdoMailing
Interesting spam/phish technique: Look for subdomains with CNAMEs or SPF records that point to abandoned domains that you can then register…and effectively take control of the subdomain or SPF. They haven’t seen any cases where it’s been used to host a phishing site at, say, an msn.com subdomain, but they’ve seen thousands of cases where […]
- The Spammers, The!
I recently noticed that the mail server was experiencing 4 times the typical number of SMTP connections. It didn’t seem to be under any stress, though, not as far as server load went. So I watched the log file trail, and saw a bunch of messages coming in to nonexistent users with the pattern, FirstnameLastname@alternativebrowseralliance.com. […]
- Blocking spam by source
A brief history: Spammers send mail directly to victims. Server admins block by source, victims complain and try to get spammers kicked off their networks. Spammers relay through third-party servers to disguise their origin. Server admins shut close relays, and block mail from open relays. Spammers relay through trojaned zombies straight to victims. Network admins […]