Re: smtp questions

Forcing "the sender's domain address [to] be resolvable " is definetly
a " simple anti-spam technique". I just spammed myself. Couldn't
yahoo stop a lot more spam by only accepting mail requests when a DNS
lookup of the domain of the sender address matches the source IP
address of the very packets that make up the email itself? What am I
missing?

Dennis Byrne

----- Original Message -----
From: "DENNIS BYRNE" <asdcb1@uaa.alaska.edu>
Date: Thursday, March 4, 2004 2:35 pm
Subject: Re: smtp questions

> I changed my code to:
>
> Dim message As New System.Web.Mail.MailMessage()
> message.From = "asdcb1@uaa.alaska.edu"
> message.To = "cis410webportalgroup@yahoogroups.com"
> message.Subject = "HiTechAlaska Newsletter"
> message.Body = tboxnews.Text
> SmtpMail.Send(message)
> message.To = "dennis@design-pt.com"
> SmtpMail.Send(message)
> SmtpMail.Send("HiTechAlaska", "asdcb1@uaa.alaska.edu", _
> "HiTechAlaska Newsletter", tboxnews.Text)
>
> when I went to check my email, I got all three emails and your
> suggestion. Thanks.
>
> Dennis Byrne
>
> ----- Original Message -----
> From: Arthur Corliss <acorliss@nevaeh-linux.org>
> Date: Thursday, March 4, 2004 2:15 pm
> Subject: Re: smtp questions
>
> > On Thu, 4 Mar 2004, DENNIS BYRNE wrote:
> >
> > > I am writing an app with the following 3 lines:
> > > SmtpMail.Send
> > > ("HiTechAlaska", "cis410webportalgroup@yahoogroups.com",
> > "HiTechAlaska> Newsletter", tboxnews.Text)
> > > SmtpMail.Send("HiTechAlaska", "dennis@design-pt.com",
> "HiTechAlaska> > Newsletter", tboxnews.Text)
> > > SmtpMail.Send("HiTechAlaska", "asdcb1@uaa.alaska.edu",
> > "HiTechAlaska> Newsletter", tboxnews.Text)
> > > Sorry if it wraps. I get the message at only one of the addresses
> > > above - asdcb1@uaa.alaska.edu . Attached is the smtp log.
> This log
> > > explains why I don't get the email at dennis@design-pt.com
> > because of
> > > the following line:
> > >
> >
>
553+5.1.8+<HiTechAlaska@DRINKA03>...+Domain+of+sender+address+HiTechAlas
> > ka@DRINKA03+does+not+exist
> > >
> > > But I can't figure out why I am not receiving the email at
> > > cis410webportalgroup@yahoogroups.com (which would forward to
> > > asdcb1@uaa.alaska.edu). Here's my confusion. The response
> > codes I get
> > > from the yahoo server are 250, 354 and 221 - the same codes I
> > get from
> > > the uaa server. design-pt.com is the only one that gives me
> the
> > 553,> so why isn't it the only one that rejects me.
> > > Both yahoo and design-pt give me QUIT. I will admit that I
> have not
> > > looked up the above codes in whatever RFC I should already
> have
> > looked> at.
> >
> > SMTP codes:
> >
> > 553: Requested action not taken: mailbox name not allowed
> >
> > -and-
> >
> > 250: Requested mail action okay, completed
> > 354: Start mail input; end with <CRLF>.<CRLF>
> > 221: System status, or system help reply
> >
> > The last three would be what I would expect for a successful
> > deliver of mail.
> > The first would be what I would expect from any smtp host using
> a
> > rule that
> > demands the sender's domain address be resolvable (a simple anti-
> spam> technique).
> >
> > If you're not getting the mail through yahoo I would assume that
> > it's using a
> > milter that's doing the sender domain resolution after accepting
> > the mail, at
> > which point it's just dumping it to /dev/null rather than
> > forwarding it on.
> >
> > Looks to me like everything's working the way it should, given
> the
> > data you're
> > using to send it out. If you can, try forcing the sender
> address
> > to a
> > resolvable domain and see if you can get mail past design-pt and
> > yahoo.
> > --Arthur Corliss
> > Bolverk's Lair -- http://arthur.corlissfamily.org/
> > Digital Mages -- http://www.digitalmages.com/
> > "Live Free or Die, the Only Way to Live" -- NH State Motto
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> >
> >
> >
>
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Received on Thu Mar 4 15:44:07 2004