Date: Sun, 21 Mar 1999 08:26:59 -0800 From: dan@wolf.com To: Ed Terry <edterry@computer.org>, freebsd-questions@FreeBSD.ORG Subject: Re: FreeBSD Mail server Message-ID: <19990321082659.A9384@ns.wolf.com> In-Reply-To: <4.1.19990321092636.00a62bd0@mail.visi.com>; from Ed Terry on Sun, Mar 21, 1999 at 09:54:53AM -0600 References: <4.1.19990321092636.00a62bd0@mail.visi.com>
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> Any attempt to send email while logged into the NT domain, whether by > direct network connection or remote dialup connection, will fail if the > email "FROM" field contains a non-domain user id. It's probably best to *not* defeat this configuration - allowing 3rd-party email relay is an open invitation for SPAMmers to abuse your system and your bandwidth, and you can be certain that as soon as you open your mail server to 3rd party relay that you WILL be targeted and abused by SPAMmers. > Eudora reports the following error message: > > "Can't send to 'anyuser@any.com'. The server gives this reason: '571 > <anyuser@any.com> ... Sorry, we do not relay'. " > > Our system administrator has been unable and/or unwilling to find the > configuration parameters that control this blocking of non-domain based > return addresses. The best solution would be to configure your system to allow relay by a restricted set of IP addresses, or (best solution) configure everybody's e-mail clients to use "From:" addresses within one of your e-mail domains. For information on configuring sendmail with an eye to managing the 3rd-party relay problem, check out the material available at http://www.sendmail.org Dan Mahoney dan@wolf.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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