Forwarding Setup

permalink · #1 (**permalink**) 05-16-2005

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Hello,

I cannot figure out if this is even possible after many hours of
research. I am currently moving our email and web hosting to a dedicated
server. Here is what I would like it to do, and if anyone can point me
in the direction of the right how-to / man page I would be much obliged.

I have single server with a single IP address.
that will:
host our primary email boxes (princetonsearch.com)
be able to forward messages from our 20 + old domains to
princetonsearch.com domain.

These I know how to do, here is where it gets beyond me.

We are using message labs for our email filtering, princetonsearch.com's
MX record is set to message labs, however I need a way to

a) forward messages from charles.todd@ourolddomain.com to
charles.todd@princetonsearch.com with it going through the message labs
filter. To get message labs to take it correctly, the message has to
appear to be for charles.todd@princetonsearch.com when it gets there.

b) I use SMTP auth to make sure users are allowed to relay messages, I
need a way to set postfix so unless a connection is using a valid SMTP
auth user or message labs, it drops the message, basically I need to
protect my users from direct IP spamming / viruses.

One idea I had was to somehow check the headers of all messages, and if
they haven't been touched by message labs to send them to message labs
so they can filter then send them back to us. However that opens us up
to spoofed header attacked (and I don't have a clue how to setup that
sort of filter)

Thanks

Charles

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<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2>Hello,</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>I =
cannot figure out=20
if this is even possible after many hours of research. I am currently =
moving our=20
email and web hosting to a dedicated server. Here is what I would like =
it to do,=20
and if anyone can point me in the direction of the right how-to / man =
page I=20
would be much obliged.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>I =
have single=20
server with a single IP address.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT></FONT></SPAN><FONT =
face=3DArial><FONT=20
size=3D2>t<SPAN class=3D796445118-16052005>hat will: =
</SPAN></FONT></FONT></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>host =
our primary=20
email boxes </FONT></SPAN><SPAN class=3D796445118-16052005><FONT =
face=3DArial=20
size=3D2>(princetonsearch.com)</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>be =
able to forward=20
messages from our 20 + old domains to princetonsearch.com=20
domain.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>These =
I know how to=20
do, here is where it gets beyond me.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>We are =
using message=20
labs for our email filtering, princetonsearch.com's MX record is set to =
message=20
labs, however I need a way to</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>a) =
forward messages=20
from <A=20
href=3D"mailto:charles.todd@ourolddomain.com">char les.todd@ourolddomain.c=
om</A> to=20
<A=20
href=3D"mailto:charles.todd@princetonsearch.com">c harles.todd@princetonse=
arch.com</A>=20
with it going through the message labs filter. To get message labs to =
take it=20
correctly, the message has to appear to be for <A=20
href=3D"mailto:charles.todd@princetonsearch.com">c harles.todd@princetonse=
arch.com</A>=20
when it gets there.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial =
size=3D2>b) I use SMTP=20
auth to make sure users are allowed to relay messages, I need a way to =
set=20
postfix so unless a connection is using a valid SMTP auth user or =
message=20
labs, it drops the message, basically I need to protect my users from =
direct IP=20
spamming / viruses.</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial size=3D2>One =
idea I had was=20
to somehow check the headers of all messages, and if they haven't been =
touched=20
by message labs to send them to message labs so they can filter then =
send them=20
back to us. However that opens us up to spoofed header attacked (and I =
don't=20
have a clue how to setup that sort of filter)</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2>Thanks</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2>Charles</FONT></SPAN></DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D796445118-16052005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV></BODY></HTML>

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