Tom Ivar Helbekkmo writes:

"Mark A. Lewis" mark@siliconjunkie.net writes:

...

Lets say that Acme Widget has their mail hosted with Hostco. Acme Widget would rather not have mail.hostco.com in the mail headers for whatever reason. So, hostco doesn't setup a ptr record for it. This does not make Acme Widget or Hostco any more likely to be spammers, it just makes you more likely to drop their mail.

Actually, the problem you're describing is routinely solved at any decent ISP *without* breaking any rules. If the above were a genuine scenario, I would conclude that Hostco is run by nincompoops. ;-)

For the posterity of the list, and the wonderful information that's been provided so far for all of the newbie nincompoops out in CentOS list lurker-land ... Let's say that I'm a nincompoop newbie sysadmin from HostCo that would like to avoid breaking any rules. (In reality, I'm a PHB, and I let my sysadmin worry about the rule-breaking.) How would I go about providing a good, solid *matching* ptr (as in, mail from AcmeWidget.com reflects to mail.AcmeWidget.com at x.x.x.219 ... which also happens to be mail.hostco.com) for the bazillion and one virtual-hosted email accounts on mail.hostco.com?

-Karl Katzke