DNS on NW 5.1 sp6
I am having problems getting GWIA or our listserver to resolve names
with our internal DNS server. I'm trying to do this because our ISP's
backup email servers have been overloaded since MyDoom came out and it
could take a day or two before email addressed to mydomain.org address
comes back in. In other words, I want email addressed to ourdomain.org
and coming from the lyris listserver or through GWIA stays inside our
network. Right now, if it comes from the listserver, it goes out to the
Internet. If it comes from a GroupWise client but uses an alias or some
other form of the address from someone's frequent contacts that is not
the internal mailbox address, it goes out to the Internet. I have tried
for a long time to get this to work, but have had no success.

Our setup is like this:

Incoming email:
- All incoming email goes through virus scanning server first (Webshield
e50). It is set up to accept email to several domains (mydomain.org,
lyris.mydomain.org., domain2.org, domain3.org).
- GroupWise is set up to receive email addressed to mydomain.org,
domain2.org, domain3.org.
- Lyris is setup to receive email addressed to lyris.mydomain.org.

Outgoing email:
- GroupWise is set up to send email directly to the Internet
- Lyris is setup to send email directly to the Internet
In both cases I have our internal DNS server as the first nameserver

DNS server:
I have these domains setup: mydomain.org, domain2.org, domain3.org

mydomain.org
@
lyris.mydomain.org (Attributes: Preference=10
Exchange=lyris.mydomain.org)
mail.mydomain.org (Attributes: Preference=1
Exchange=mail.mydomain.org)
smtp.mydomain.org (Attributes: Preference=10
Exchange=smtp.mydomain.org)
lyris
x.x.x.14 (ipaddress of lyris server)
mail
x.x.x.12 (ipaddress of webshield server)
smtp
x.x.x.6 (ipaddress of GWIA server)

domain2.org
@
mail.domain2.org (Attributes: Preference=10
Exchange=mail.domain2.org)
mail
x.x.x.12 (ipaddress of webshield server)

domain3.org
@
mail.domain3.org (Attributes: Preference=10
Exchange=mail.domain3.org)
mail
x.x.x.12 (ipaddress of webshield server)

Any ideas on how to fix this? Are my MX records wrong?

Thanks,
Mary