Date: Mon, 17 Sep 2007 17:25:02 -0700 From: Chris Maness <chris@chrismaness.com> To: Chuck Swiger <cswiger@mac.com> Cc: FreeBSD-Questions List <freebsd-questions@freebsd.org> Subject: Re: SMTP Error from my server? Message-ID: <46EF1ADE.7020806@chrismaness.com> In-Reply-To: <4BF548AD-D73A-4822-85D0-B24B03F57E51@mac.com> References: <46EF0243.4000604@chrismaness.com> <46EF0352.9050800@sequestered.net> <46EF0841.8070307@chrismaness.com> <4BF548AD-D73A-4822-85D0-B24B03F57E51@mac.com>
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Chuck Swiger wrote: > On Sep 17, 2007, at 4:05 PM, Chris Maness wrote: >>> Looks to me like a failed sender verification callout-- these are >>> generally construed to be abusive. I can't easily tell from your >>> munging whether it's your server or Adelphia that's doing it, though. >> >> This is the only e-mail address that I am having this problem with, >> and it has been going on for a year or so now. What other info would >> you guys need to tell what it is. I guess I don't understand the >> whole "sender verification callout" I'll have to do a little google >> to find out. > > The idea is pretty simple: when someone sends you an email, you delay > accepting it until you can confirm that you can send a reply back to > the sending address, or more precisely, check whether you can do a > MAIL FROM: your domain and RCPT TO: the sender, and have it return OK, > without actually going into the DATA phase and delivering a test message. > > This idea works fine for normal email addresses, but fails miserably > with certain types of automated email which is not intended for people > to reply to, and it also tends to lose out with TDMA > (http://tmda.net/). More importantly, it also fails to work with > itself-- other people using "sender verification callouts" cause a > loop of failed deliveries, as neither side trusts the other. > > ---Chuck > Can I turn it off for this sender? Chris Maness
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