arkaine

6 ms·

1. 1.▲
   by arkaine 8y ago

   Good luck with AWS/Azure IP addresses. Most cloud providers have their entire IP blocks of compute services (VM, etc.) blacklisted by the majority of DNSBL and antispam actors. If the EC2 instances act as the last outgoing relay (the l
2. 2.▲
   by arkaine 8y ago

   Mailinblack does this for more than ten years now, mostly in France. This technique is called a "challenge-response" filtering. It does work pretty well with other antispam techniques. Their solution send a daily digest to the use
3. 3.▲
   by arkaine 8y ago

   The "My address" autocompletion gave me that feeling too.
4. 4.▲
   by arkaine 9y ago

   The Jaff waves and the massive amount of threats make it really hard to identify. Wannacrytor may not be found directly attached in the mail, only a downloader for it (like office docs/pdfs/js) might be.
5. 5.▲
   by arkaine 12y ago

   Lack of arp/layer 2 isp, routing. There is also a mistake inside the DNS part. DNS queries are done from the client - and this is actually true for a majority of client/server requests - by opening a dynamic random port above 4915