Restrict Incoming Mail

[Steve Swaney]

> -----Original Message-----
> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of Steve Swaney
> Sent: Thursday, October 28, 2004 12:50 PM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: Restrict Incoming Mail
>
> > -----Original Message-----
> > From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> > Behalf Of Brendan Chard
> > Sent: Thursday, October 28, 2004 12:03 PM
> > To: MAILSCANNER at JISCMAIL.AC.UK
> > Subject: Restrict Incoming Mail
> >
> > This is more of a post installation, big picture question but hopefully
> > some
> > of you have done this.
> >
> > I now have a FreeBSD box up and running with MS that is serving as a
> mail
> > relay for 4 other FreeBSD boxes that actually have the user accounts on
> > them.
> >
> > How can I restrict the FreeBSD boxes behind the mail relay server to
> only
> > accept incoming mail from the MS relay server and localhost?  Can this
> be
> > done while still allowing the users to send mail out through the FreeBSD
> > boxes that they log into?
> >
> > Thanks,
> > -Brendan
> > brendan at chard.net
>
> First Method - Look at the MAQ. specifically:
>
>         0.5 What if I want just a gateway that filters mail sends to
>         my other (Exchange, Notes...) server
>         (and block emails to unknown recipients)?
>
> The exact methods will depend on which MTA you use but the basic idea is
> the
> same.
>
> 1. Write scripts that create a map or DB of the users on the mail hubs.
> The
> links in the MAQ describe a few way's to do this but your setup will
> probably require custom scripts.
>
> 2. Modify your Mat to use this map to validate the recipient before
> accepting the mail. Again the links in the MAQ describe a few way's to do
> this.
>
> I have a script that does this for one backend POP/IMAP server. Drop me a
> line off list if you want a copy
>
> Second Method- Milter-Ahead:
>
> I tried testing this very quickly but couldn't get it to work with an
> Exchange 2003 server on the back end, but the problem could have been that
> since the mail was queued for MailScanner, milter-ahead  thought the user
> was local. This is what the logs appeared to reflect.
>
> This is a very promising method of blocking email at the gateway. It is
> dead
> easy to install and configure.
>
> Does anyone have this working with MailScanner?
>
Sorry I meant to include the link for Milter-Ahead:

        http://www.milter.info/milter-ahead/index.shtml

Steve

Steve Swaney
President
Fortress Systems Ltd.
www.fsl.com
steve.swaney at fsl.com


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