Sending emails to internal addresses

[allenj]

I have a client connected to th ISP through a gateway XXX.yyy.zzz.65. There
is a router with an external IP address of xxx.yyy.zzz.70 which is NATted to
deflect a series of Mac computers with static IP addresses. They also have an
SBS 2003 server running exchange and receining email from the ISP through the
pop2 connector.connected to the same gateway with an external static IP
address of xxx.yyy.zzz.75 and four XP SP2 workstations receiving ,local IP
addresses thtough DHCP. The Mac can send email to the XP workstations however
the XP workstations cannot initiate email to the Mac workstations. The XP
workstations can send email to fully external addresses and can send a reply
to emails initiated by the Mac computers. However these XP workstations
cannot initate an email to the mac computers.

Suggestions and/or solutions would be gratefuly appreciated. Thank you.

 

[Lanwench [MVP - Exchange]]

In

I have a client connected to th ISP through a gateway XXX.yyy.zzz.65.
There is a router with an external IP address of xxx.yyy.zzz.70 which
is NATted to deflect a series of Mac computers with static IP
addresses. They also have an SBS 2003 server running exchange and
receining email from the ISP through the pop2 connector.connected to
the same gateway with an external static IP address of xxx.yyy.zzz.75
and four XP SP2 workstations receiving ,local IP addresses thtough
DHCP. The Mac can send email to the XP workstations however the XP
workstations cannot initiate email to the Mac workstations. The XP
workstations can send email to fully external addresses and can send
a reply to emails initiated by the Mac computers. However these XP
workstations cannot initate an email to the mac computers.

Suggestions and/or solutions would be gratefuly appreciated. Thank
you.

I started reading this and it made my head hurt....I can't figure out what
you're asking, nor what your setup is. Can you try to repost more clearly?
Separate paragraphs/bullet points might help....

 

[allenj]

I can appreciate your hurt head. Mine haas been spinning on this for a while.
I will come back at you with a clearly rendering of the isuue. It's too bad I
can't include a diagram for comprehendion purposes.

Thanks for your patience

 

[allenj]

ISP
(gateway
x.x.x.65)

T-1
switch
Router SBS2003
(x.x.x.70 (x.x.x.75)
Mac - many XP SP2 - 4
Static Ips IPs via DHCP

Everyone is using a new copy of Outlook. The Mac's can
email the XP SP2s and the XP SP2 can reply to these
emails. The XP SP2s can email anywhere else but they
cannot email the Mac's

I hope this makes it clearer.

Thanks