How do I configure MX records for a new domain email address?
Posted on 2006-05-25
This one is definately worth 500 points!
We have a primary email domain that handles the bulk of our email. We also have an internal exchange server 2003 that is our email server. On our email accounts internally, I have set up each user to also accept mail from a total of four additional domain suffixes that we own. All of those MX records are hosted by Choiceone DNS servers in Ohio somewhere. They all point to our outside IP (firewall) and when that traffic hits that IP address it is NAT'd on through to our exchange server and delivered internally. A while ago we decided to se a hosted, off-site SPAM filter so we changed things to relay from ChoiceOne to our off-site SPAM filter and then on to us. So currently the mail goes like this:
Outgoing goes like this:
Well now we have purchased two new domains, "newdomain.biz" and "newdomain.com". They are through an outfit called, "CheapDomainRegistration.com". I can log into their server and configure the A record, CNames and Mail Exchanger records for each new domain. I thought I had it configured correctly, but when I had someone off-site send an email to me @newdomain.biz and also ".com" it failed to deliver to me. The sender got this failure notification:
"The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
< slot95.h-pmx-msn-6.binc.net #5.1.1 SMTP; 550 5.7.1 Unable to relay for email@example.com>"
The "slot95.h-pmx-msn-6.binc.net" is the off-site spam filer, server that relays our mail for our old email domain(exchange)
What I configured was this:
A Record I configged as:
host = "@"
points to= IP address of our firewall (our external IP) This is not the IP used to connect to our Outlook web access though
CNAME records I left as is with their configuration for E, pop, mail, imap, email, smtp, mobilemail, pda and webmail all pointing to their default servers and "www" and "ftp" which had "@" as the configuration.
MX (Mail Exchanger)
I configured as:
Goes to=" server address furnished to me by our off-site SPAM Filter provider" actually two of them for redundancy I was told.
Two Text Records One is our business owners name and business address and the second is named "@" and contains a string with the mx record and ending in a minus A
What I got from our spam filter relay provider were two server names for each new domain(two each for redundancy) each one started with the letters "MX" tnen a space then the number "10" for the primary server(number "20" for the redundant, second server) a space and then a continuous string ending in ".net". The interface would not allow spaces in the server names(addresses) so I ended up dropping the "MX 10" or "MX 20" prefix from each server, but I don't think that's the problem.
What am I doing wrong?