Date: Wed, 14 Mar 2001 09:42:54 -0500 (EST) From: Ralph Huntington <rjh@mohawk.net> To: "Bruce M. Walker" <bmw@borderware.com> Cc: Jim Durham <durham@w2xo.pgh.pa.us>, freebsd-security@FreeBSD.ORG Subject: Re: Sophos and Virus return mail Message-ID: <Pine.BSF.4.21.0103140939550.4793-100000@mohegan.mohawk.net> In-Reply-To: <200103141333.f2EDX0J19096@fusion.borderware.com>
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> > > (This is one case where blocking of port 25 by ISPs is a good thing.) > > > > If port 25 is blocked, then how is legitimate mail accepted? -=r=- > > I meant, of course, blocking of port 25 to all destinations but the > "officially sanctioned mail server". ISPs generally provide you > with a mail server IP which you are supposed to forward all mail > to. Forcing all customers to go through that helps (a little) to > prevent spamming via open relays. Yes, it annoys some, but clients > with dynamic addresses on DSL/cable modems usually don't care. Okay, so you meant blocking the 'escape' of packets bound for port 25 on any machine *other*than* the approved smtp host, which, of course, does not relay, correct? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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