There is a ptr for mail.imcu.com to 206.18.123.221 though.
________________________________ From: Richard Stovall [mailto:rich...@gmail.com] Posted At: Friday, August 06, 2010 9:35 AM Posted To: itli...@imcu.com Conversation: Local server name appears on the Internet DNS Subject: Re: Local server name appears on the Internet DNS The PTR record for 206.18.123.221 resolves to 03030611n4m055.imcu.local. Ask your ISP to change it to mail.imcu.com or whatever is appropriate. On Fri, Aug 6, 2010 at 9:24 AM, itli...@imcu.com <itli...@imcu.com> wrote: I am really confused. I am using MXToolBox and the SMTP tool. I get the below results: 220-nachodevice.imcu.local ESMTPIronport Success Not an open relay. 0 seconds - Good on Connection time 0.546 seconds - Good on Transaction time OK - 206.18.123.221 resolves to 03030611n4m055.imcu.local OK - Reverse DNS matches SMTP Banner Session Transcript: HELO please-read-policy.mxtoolbox.com 250 nachodevice.imcu.local [16 ms] MAIL FROM: <supert...@mxtoolbox.com> 250 sender <supert...@mxtoolbox.com> ok [31 ms] RCPT TO: <t...@example.com> 550 #5.1.0 Address rejected. [31 ms] QUIT 221 nachodevice.imcu.local [47 ms] The nachdevice.imcu.local is my ironport, I get that The 03030611n4m055.imcu.local is my Exchange server, on the internal side of the firewall. I have an mx record for the ironport's external port. I do not know why the 0303... name is being published to the world?? Any ideas?? ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
