I haven't seen this problem with Exchange 2007 but I'm not sure any of my clients have this exact situation. I think the solution is for them to pick a different name for their PTR/A record rather than one that is used internally. spamdyke doesn't care if the PTR record matches the site's name, only that it resolves.
-- Sam Clippinger On 2/12/10 8:45 AM, Faris Raouf wrote: > I had a very interesting conversation with a sysadmin who is in charge of > mail server whose emails our Spamdyke servers are rejecting because their > PTR has no corresponding A record (reject-unresolvable-rdns in > spamdyke.conf). > > The sending server runs MS Exchange 2007, and apparently when they add an A > record for their PTR, their webmail (whether accessed externally or > internally) stops working. > > Does anybody have any experience of Exchange 2007? Does this make any sense? > It doesn't to me. But I don't know enough about how Exchange works and how > its webmail thing works either to make any real comment. My only guess is > that it has something to do with the exchange server using a local private > IP for the webmail server internally, and when this is effectively changed > to a public IP it all falls down? I don't know why they can't just change > the external DNS and leave the internal stuff alone, unless the Exchange > server actually runs the external DNS too? Argh. It makes my head hurt just > thinking about it. > > Obviously we can whitelist them - problem solved - but not everybody will do > that for them and they are going to face some serious problems before long > as more and more ISPs and mail servers come to reject on an unresolvable > RDNS. > > And if it is a generic problem with Exchange then that's going to be a > bigger problem for us and others. > > Faris. > > > > > > > > > _______________________________________________ > spamdyke-users mailing list > [email protected] > http://www.spamdyke.org/mailman/listinfo/spamdyke-users > _______________________________________________ spamdyke-users mailing list [email protected] http://www.spamdyke.org/mailman/listinfo/spamdyke-users
