Doing an nslookup, it appears that 206.18.123.221 resolves to 03030611n4m055.imcu.local.
nslookup 206.18.123.221 Name: 03030611n4m055.imcu.local Address: 206.18.123.221 Aliases: 221.123.18.206.in-addr.arpa -Andy -----Original Message----- From: itli...@imcu.com [mailto:itli...@imcu.com] Sent: Friday, August 06, 2010 9:25 AM To: NT System Admin Issues Subject: Local server name appears on the Internet DNS 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/> ~ ********************************************************************** CONFIDENTIALITY NOTICE - The information transmitted in this message is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and destroy all copies of this document. Thank you. Butler Schein Animal Health ********************************************************************** ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
