So once I do this I will get my internal address not my external address.
C:\Windows\System32\Drivers\etc>nslookup mail.imcu.com Server: 0304090304zu55.imcu.local Address: 10.0.50.205 Name: mail.imcu.com C:\Windows\System32\Drivers\etc>nslookup Default Server: 0304090304zu55.imcu.local Address: 10.0.50.205 > Set type=MX *** Can't find address for server type=MX: Non-existent domain > Imcu.com Server: 0304090304zu55.imcu.local Address: 10.0.50.205 Non-authoritative answer: Name: Imcu.com Address: 12.145.177.146 > set type=mx > imcu.com Server: 0304090304zu55.imcu.local Address: 10.0.50.205 Non-authoritative answer: imcu.com MX preference = 5, mail exchanger = mx1.imcu.com mx1.imcu.com internet address = 38.109.185.193 > set type=a > mail.imcu.com Server: 0304090304zu55.imcu.local Address: 10.0.50.205 Name: mail.imcu.com > 38.109.185.193 is my external address. From: Kennedy, Jim [mailto:[email protected]] Posted At: Monday, October 29, 2012 10:12 AM Posted To: [email protected] Conversation: DNS? Subject: RE: DNS? That looks correct. Be sure to flush dns on the machine doing the lookup. To be sure you should first do an nslookup on the domain's MX and make sure you get mail.imcu.com nslookup Set type=MX Imcu.com That should return mail.imcu.com Then check the A record for mail.imcu.com and you should be good to go. From: [email protected] [mailto:[email protected]] Sent: Monday, October 29, 2012 10:09 AM To: NT System Admin Issues Subject: RE: DNS? I'll recycle the dnscache and post my internal DNS records here to make sure I am doing it correctly. New Primary Zone IMCU.COM imcu.com A 12.145.145.177.176 imcu.com MX mail.imcu.com mail.imcu.com A 10.0.50.4 (((((internal address)))))) www.imcu.com A 12.145.177.176 (((((external address for managed website)))))) board.imcu.com A 10.0.10.21 (((((internal address)))))) Should that be all that I need? I have vpn.imcu.com, ftp.imcu.com but they are programmatically only accessible through the firewall so outside in only. After the recycle of dnscache I should be able to do an nslookup for mail.imcu.com and get the ip 10.0.50.4 just like in my hosts file(Which I have commented out until after this experiment works or fails) Thanks From: Kennedy, Jim [mailto:[email protected]] Posted At: Monday, October 29, 2012 8:18 AM Posted To: [email protected] Conversation: DNS? Subject: RE: DNS? Did you also add an MX record for that domain pointing at mail.imcu.com? Most MTA's will fall back to the A record for the domain, so you could also put up an A record for imcu.com. But I wouldn't count on that. Exchange didn't until 2007 or so. From: [email protected] [mailto:[email protected]] Sent: Sunday, October 28, 2012 1:50 PM To: NT System Admin Issues Subject: DNS? I have added a new Forward lookup zone for IMCU.COM on my local active Directory. I have added an 'a' record for 10.0.50.4 for mail.imcu.com in that zone. I do not resolve the mail to the ip. If I add that record in my hosts file I can browse it easily. What is wrong in my DNS set up? Server 2003 active directory. ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
