>My company and our parent company are both behind a corporate firewall but
>with separate domains and mail servers. As of last Thursday we cannot send
>mail to one another. When I do send any of their users mail I get it
>returned from our postmaster account as an unknown host. Does this mean
>that DNS is unable to recognize their domain as external to ours?
It means that Imail's DNS lookup failed to identify theirdomain.com.
>I can resolve their MX records and the IP addresses of their mail and name
>servers through DNS.
When you nslookup theirdomain.Com from the Imail machine, using the same ip
for the DNS as you've put in Imail, that's what counts.
nslookup -type=MX theirdomain.com imailsDNS
>I can resolve their SOA record.
>The only glaring part of their configuration is that their DNS server is not
>part of the same domain as their mail server.
doesn't matter at all.
>Anything else I should look
>for?
Just get on the Imail machine and try to nslookup theirdomain.com, esp the
MX record, just as Imail would be trying to do.
Len
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