Date: Fri, 12 Jun 1998 16:00:04 -0600 (MDT) From: Stephen Mathezer <mathezer@harbor.ab.ca> To: questions@FreeBSD.ORG Subject: sendmail/dns/relaying question Message-ID: <Pine.SOL.3.96.980612154718.16943C-100000@gemini>
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This isn't really FreeBSD specific but I'm hoping someone out there can
help me with this.
Suppose I have two domain names which cover the same set of IP addresses.
eg: fw.domain1.com = 123.123.123.123
fw.domain2.com = 123.123.123.123
Now, I have a firewall which is relaying mail from the Internet to an
internal mail server.
I am trying to use the relay_based_on_MX feature in Sendmail 8.9.0
Neither domain1.com nor domain2.com is in sendmail.cw since I want to
relay mail for these domains to an internal mail server.
The internal DNS used by the firewall lists fw as the mail exchanger for
the domain so things sort of work.
Here is my problem
I want to use the short form of the DNS tables.
eg:
db.both-domain looks like:
@ IN SOA fw.domain1.com. me.domain1.com. (
.........)
@ IN A 123.123.123.124
MX 10 real-mail-server
MX 20 fw
named.boot then looks like
primary domain1.com db.both_domains
primary domain2.com db.both_domains
All machines have the same addresses in both domains the two domain stuff
is simply so that our marketing folks can be happy with our fancy domain
name and the rest of us can use the one we have always used.
I really would rather not maintain two db files separately for the domains
which is why I am using the short form and only using one file.
The problem arrives when I try to send mail to user@domain2.com from the
Internet. The relay_based_on_MX doesn't allow the relay because the
firewall (which to the outside world is our primary MX) decides that it is
not an MX for domain2.com since it knows that it's name is fw.domain1.com.
So, is there a way that I can make my firewall realize that it is in both
domains or is there a simpler way of going about this. The goal I am
trying to acheive here is:
1- fw is the primary MX for domain1.com and domain2.com as far as the
outside world is concerned.
2- fw does NOT deliver mail locally for either but rather forwards it to
real_mail_server.domain1.com (acheived by using a different name server
internally which lists a different set of MXs which do include fw)
3- I only need to maintain _1_ db file for both domains under DNS
4- I am a good neighbour and limit the spam I allow to pass through my
system.
Thanks for reading my long winded query I would appreciate any advice.
-Steve
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