Exchange 5.5 I'm a little confused on Reverse DNS. I kind of understand the concept that with Reverse DNS enabled the Mail from: entry must resolve to a valid domain or it will get rejected. Some I have some basic questions:
I take it Exchange 5.5 does not support Reverse DNS? How about Exchange 2000? How effective is Reverse DNS to help the control of Spam? What problems/issues will we encounter if we do implement reverse DNS in some for on front end servers whatever it may be? What about users who have POP and have their return address set to be something other than their ISP but they use the ISP as the relay? When they state the Mail From: they mean the From: in the display area and not all the routes? If you have a front end relay like PMDF/VMS which relays first.last@domain to a messaging system, reverse DNS will not prevent spam to the receiving systems since it will also validate from the relay? Pete Pfefferkorn Senior Systems Engineer/Mail Administrator University of Cincinnati 51 Goodman Street Cincinnati, OH 45221 Phone - (513) 556-9076 Fax - (513) 556-2042 _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
