[AMaViS-user] Extension of amavisd-new

[ralf k. <rk...@wi...>]

Hello,

we are a ISP in Germany, and successfully use the software amavisd-new
to the virus search and to the Extension Blocking.
It works very well within these two ranges. Now we would like also the
Spam filter functions to use, have thereby however the following
configuration to support:

Our policy says not to deliver spam to recipients, which are listed in a
local domain table.
These recipients represent our customers, also there should be no
nondelivery message back
to the sender of this spam message, nor to the recipients.
The blocked message has to be delivered to an special mail account on
another server, where
our customers can have a look at the blocked messages via an webinterface,
but this function will be served by us.

All mails, where the sender is a local domain and the recipient ist not a
local domain,
should not examined for Spam, and always delivered to the recipient.
Our customers should be normaly in the position to send anything they =
want,
because
they pay for our service to deliver email.
Our contracts forbid sending Spam, and we will stop every customers, =
who'll
try to do it,
with this policy we only try to minimize the false positives send by our
customers.
Believe, we hat spam and all spammers.

An exception to the above policy is, if sender and recipient are local
domains (both are customers), then
the spam filter should be active and block the mail, and again no
nondelivery message should be send to anyone.
The blocked message should be delivered to the special mail account, like
above.

We are very much interested in the realization of these policy, and
also willing to pay for such an extension.

Now to our questions :

Is there a possibility to check for the senders ip address in the header =
of
the mail,
since it would be possible to fake the sender address ?
If the senders IP Address belongs to our ip range, it should always be
delivered, see above.

Is this configuration with the software possible ?

How much would cost, to extend the software accordingly so that it
offers these possibilities?


Mit freundlichen Gr=FC=DFen

Ralf Kirmis
Techn. Support
Wizard Computersysteme GmbH