On Thursday 07 February 2008, Marco Peereboom wrote: > What you forget here is that "most" don't adhere to standards.
I'm not sure it's a standard, but for many it (matching the servers helo name with the PTR record) is standard practice. Some then continue with a forward lookup and expect the A record to match the connecting IP. Last I looked the University of Michigan was one of several sites that used this level of email server identification before accepting email. In the past, before the days of major spam, one could always adjust to such paranoid security measures as messages were either received or bounced. But due to the increase in forged from addresses many servers no longer bounce such posts and just silently drop them. unfortunately your users, in many cases, will simply not know that mail was not delivered. -- Chris
