Date: Mon, 26 Jul 2004 15:36:11 -0500 From: Scott Blaydes <sblaydes@wtconnect.com> To: Richard Kuhns <rjk@wintek.com>, freebsd-isp@freebsd.org Subject: Re: Question about virus/spam filtering for customers with mail servers Message-ID: <41056B3B.6050304@wtconnect.com> In-Reply-To: <41056580.3050007@wintek.com> References: <41056580.3050007@wintek.com>
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Richard Kuhns wrote: > I'm hoping someone will be willing to share a better way to handle this. > > We offer virus/spam filtering for customers with their own mail servers. > We're currently implementing this by configuring the customer's firewall > to only accept smtp connections from our servers (all running sendmail > under FreeBSD 4), and the customer's MX records point to their server > first and our server(s) second and third. In most cases this works just > fine -- attempts by a mail server to deliver mail directly to the > customer fail, the mail server tries the secondary MX site (us), we > accept and filter the message and deliver it to the customer (or not). You could set up your FreeBSD boxes that are doing the scanning/filtering to be the primary and secondary MX for the domain and then use sendmail's mailertable to deliever the messages to the customers' servers. The mailertable will even let you ignore MX settings for the domain. Scott Blaydes
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