We are running Exchange2007-sp2 ,for hosted scenario and we are facing some problems ,such as spam and stuff, and i want to create a Reverse DNS records for our Exchange . here is our DNS records: (same as parent folder) MX mx1.hosting.PARENTDOMAIN.com (same as parent folder) MX mx2.hosting.PARENTDOMAIN.com mx1 A 86.51.x.18 >>>>> this one resolve mx1.hosting.PARENTDOMAIN.com mx2 A 86.51.x.19 >>>>> this one resolve mx2.hosting.PARENTDOMAIN.com our subdomain: (same as parent folder) MX mx1.hosting.PARENTDOMAIN.com (same as parent folder) MX mx2.hosting.PARENTDOMAIN.com mx1 A 86.51.x.18 >>>>> this one resolve mx1.subdomain.com mx2 A 86.51.x.19 >>>>> this one resolve mx2.subdomain.com i have created a "PTR" Records for my subdomain, 1)-- Can anyone please let me know what should be the output from nslookup>>type=ptr or MX>>>for mysubdomain.com 2)-- Should i create a ptr record also for the parentdomain?? 3)-- create these PTR on my DNS server,,or on the ISP DNS (86.51.X.X ISP )???? thank appreciate any kind of helpPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Remember to vote helpful,if the reply was helpful ,provinding information...

Hi I good tool to use for troubleshooting these kind of problems is www.mxtoolbox.com The PTR records should (mostly) be created by the ISP's and point IP -> name Let's say your send connector have a name called: mail.domain.com And you sending IP is: 1.1.1.1 Then the ISP should setup a PTR record for 1.1.1.1 and point it to mail.domain.com http://aplawrence.com/Blog/B961.html http://hosting.intermedia.net/support/kb/default.asp?id=1317 http://www.emailtalk.org/PTR.aspx Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi, For the result of “nslookup>>type=ptr or MX>>domain.com” you can refer to these two links: How to Use Nslookup to Verify DNS Configuration http://technet.microsoft.com/en-us/library/aa997324(EXCHG.65).aspx Use Nslookup to find PTR or rDNS record http://www.mailserverblog.com/2009/03/use-nslookup-to-find-ptr-or-rdns-record.html Yes you also should create a PTR record for the parentdomain. You should create the PTR on the ISP DNS(86.51.X.X ISP). If anything is unclear, please feel free to let me know. Best Regards, EvanPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.