What you need is a comprehensive, easy-to-understand book on sendmail. If
you find one, tell me... :-)
Sendmail (part of the standard Linux distribution) is very powerful and
will do all that you ask. It will allow your parent company's mail server
to act as a relay to your own mail server. When email arrives at the parent
via SMTP, it will send it on to yours, again via SMTP. This will start a
dial-up session for each email received. Your clients connect to your local
mail server using POP3 and pick up their mail. There is no dial-up ISDN
session required for this. When they send a mail destined for someone
outside the local server, it will use ISDN to send the mail via ISDN.
You will need to configure your resolver (/etc/resolv.conf) to use the
parent DNS.
All this can be done with sendmail, but it's a big, powerful, complex
system. You need to read up on it, and also ask the gurus who hang out in
the USENET comp.mail.sendmail group. Sendmail is not linux-specific, so you
will get lots of help there.
One final point. Mail can generate a lot of dial-ups. If you are worried
about ISDN costs, you should consider a mail program which schedules the
transfers. Sendmail may be able to do this, so ask the USENET people. Or
use another system; I use a program called MDaemon which runs on NT and is
excellent for my purposes. I set it to dial up three times a day, since the
office is often empty. When needed, I can do start a transfer manually.
Neil
On Thursday, October 08, 1998 1:58 PM, Chan Foo Bang
[SMTP:fbchan@extol.com.my] wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>
> I need your expertise and suggestion on this matter...
>
> Currently, our system is using a 64K ISDN dial-up. As you all know, ISDN
> dail-up is not UP all the time and it only active when there is people
> surfing or activiti in the internal network. We also have a fix ip
address.
> We are using linux firewall and have a mail server in our local network
> (behind the firewall). Our parent company have a 64K lease line. So since
> we can't host our internet mail server in our organisation( we are using
> ISDN dial-up), so we make use of our parent company lease line to host
our
> mail server. We register our domain name and whatever mail for this
domain,
> it will send to the mail server that we set up and located in our parent
> company. So when a user want to read a mail, they need to connect to the
> mail server in the parent company to retrieve mail. Sometime it is very
> uncovenience and sometime the downloading mail from this mail server to
the
> user workstation is very very slow. So what you guy will suggest to solve
> this problem?
>
> The setup is like this:-
>
>
> parent company
> our company
> with 64K lease line with ISDN dial-up with fix IP
> line 24Hours UP
> line will only UP during working hours
> geografically
different
> places
> parent.com.my
> sister.com.my
>
> |--------------------|
> |-----------------|
> | | internet
> | |
> | | -- --- --- -- --
> - - - -- - -- - - | |
> |------------------- |
> |-----------------|
>
> 1 Linux mail server
> 1 Linux mail server
> for inernal staff and internet
> currently only for internal
> 1 DNS server
> No DNS server
>
> (the primary domain is point to ip of parent company)
>
>
>
>
> It is POSSIBLE to set such a way that whatever there is a mail to our
> company (user@sister.com.my) that go to the parent company, it will
foward
> the mail to our company mail server? (since we have our own internel mail
> server) and whatever mail to user@parent.com.my remain in the parent mail
> server. If it can be done, HOW? And another thing is that how the mail
> going to foward the mail to the sister company during at night (the line
is
> not UP) if there is a mail to one of the user in sister.com.my?
>
> Thank your for the advice in advance.
>
> FB
>
>
>
>
>
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