DNS "A" Record Preventing Networked Users from Seeing Own Website

I just set up a DNS "a" record in Server Admin to point "mail.xyz.com" to my server's internal ip (10.0.1.1).
I did this so users could stay on the network with sending and receiving mail, as opposing to going out onto the web to do so. (I have MX records on Network Solutions point "mail.xyz.com" to my server's external ip.) All of their mail clients list "mail.xyz.com" as the mail server, instead of the server's internal ip.
Trouble is, when users on the network try to access our website, "xyz.com," their browsers now return an error, saying they cannot find the server.
Any idea?
Lost count Mac OS X (10.4.9)

Steve and David --
This works. I am using Server Admin. To reiterate, I
added a zone "mysite.com" and a primary server "mail"
and pointed it at my server's internal ip so my users
can stay "inside" while checking mail.
Then, to follow your suggestion, I added a machine
named "www" to zone "mysite.com" pointed to my
server's external ip.
Some questions: How can I be sure the client's
machines are going interally to the server for mail?
(When I dig it in terminal, "mail.mysite.com" returns
an "a" record for the server's internal ip -- I
suppose that is sufficient.)
Yep!
Should the primary name server for the zone be "mail"
with "www" as an added machine, or vice versa?
The primary name server just identifies the machine which is responsible for holding records for that zone (domain). Add www as a 'machine' - think of each 'machine' as a specific IP address which identifies a host, hence IP / Name partnership. Any other hostname on same IP is an 'alias' (which becomes a CNAME record in the dns file).
You say I have to do this with "any record hosted in
my public dns as a mirror." I am running three
websites from my server, all with public dns pointed
at my server. (I use the same mail
server--mail.mysite.com--for all three.) Do I need to
set up a "www" record for each website? I have no
problem accessing the sites from internal client
machines.
the basic issue is that any zone (domain) defined in your own dns becomes 'authoritative' for that domain. So when clients ask your internal dns about any zone (domain) which is defined in it, and your server does not have that record, it will respond with "no such record" and your clients must take that on face value.
Therefore, you only need to mirror records for domains which you have defined in your own dns. If you have external www.domain1.com and www.domain2.com but only have domain1.com established on your internal dns, then you only need that domain's www record mirrored. Your server will therefore not be authoritative for domain2.com and will pass all requests out to whichever external dns is authoritative for it.
-david

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