Hello out there,

I'm currently trying to figure out a configuration for two related
mailservers. The first server will be at our ISP site the second is our
internal Internet Gateway. We us a ISDN dialup line to connect to the
Internet, the line can be triggered from both sides.

The ISP Mailserver should do the following:
- collect email for local users (users who mainly work in the office) to be
delivered  to the internal mail host every half an hour or so. If there is
some special Subject line mail must be deliverd immediately. (Our ISP can
open the ISDN line)
- collect mail for remote users (users getting their mail using a pop client
from the external host) and deliver them via pop. The mail must be split up
into different mail accounts according to special header lines.
- forward mail to users in a different office to a third or fourth mail
server.
- relay the mail send from the internal mailhost.
- From the internet accept only mail to the local domain.
- From the internal mailhost relay any mail.

The internal Mailhost needs to do following:
- Get mail from the external mailhost and deliver to local users.
- Keep internal mail local, and deliver it through pop to internal users.
Again I need to split up the mail to different account according to the
Subject line.
- Relay any other mail to the external mailhost, by collecting the mail for
later delivery, sending it by a cron triggered job. Some special Subject
line should trigger immediate delivery.
- Do not accept any mail not coming from the external mailhost.


There allready is a question how to set up two related mailservers in the
discussion list, but the solution given there does not contain any solution
for the parsing of the header and immediate delivery when needed. As far as
I understand all the answers, the solution given there only works when all
mail is forwarded to the internal mailhost. I need to have mail staying out
there while the mail addresses are all of type [EMAIL PROTECTED]

One solution I'm thinking of is to move mail from the external host to the
internal by using fetchmail and pop. This requires to set up every user on
the external and the internal host. (I don't like this idea.) and does not
work at all for moving the mail from the internal to the external host. The
next idea is to use uucp over tcp. ( but this seems very oldfashioned to
me.)
I'm currently splitting the mail into differnt folders using procmail. I
allready dicovered that I could use promail with qmail, too.


I'm very thankfull for any ideas.


Michael



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