On Wed, Dec 16, 2009 at 12:12:22AM -0600, James Hess wrote:
Many sites don't use names that will necessarily be meaningful to an outsider.
Then they should expect issues with mail acceptance by outsiders.
Some sites might want to avoid certain "meaningful" RDNS entries since spammers, hackers, and other abusive users that scan IP ranges can utilize the RDNS to facilitate their activities.
This is nonsense. RDNS/DNS naming choices are a trivial obstacle to spammers et.al. who went over this speed bump at 70 MPH years ago and have been accelerating ever since. This kind of security-by-obscurity tactic is far more likely to draw their attention than evade it, as any site using it has in effect run up a large flag with "we don't understand security basics" written on it and thus made itself an attractive target. ---Rsk