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Re: [ietf-smtp] DSNs

John Levine <johnl@taugh.com> Sat, 18 April 2020 21:06 UTC

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References: <20200409230011.F039B17637D0@ary.qy> <alpine.OSX.2.22.407.2004091945050.80689@ary.qy> <20200410090430.GA75736@kiel.esmtp.org> <29104A0F-B9ED-4CD7-99B3-5A042375C68B@dukhovni.org>
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Cleverness: some
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Subject: Re: [ietf-smtp] DSNs
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In article <29104A0F-B9ED-4CD7-99B3-5A042375C68B@dukhovni.org>,
Viktor Dukhovni  <ietf-smtp@ietf.org> wrote:
>> On Apr 10, 2020, at 5:04 AM, Claus Assmann <ietf-smtp@esmtp.org> wrote:
>> 
>> On Thu, Apr 09, 2020, John R Levine wrote:
>> 
>>> Oh, RFC 3461.  Agreed, it's basically an SMTP level web bug.  Nobody
>>> implements that.
>> 
>> sendmail implemented it too (more than 20 years ago?). I guess it
>> should read "nobody enables/uses it"?
>
>And likewise Postfix also implements RFC3461.  It is on by default.
>I turn it off on inbound edge systems, and ignore remote "DSN" on
>outbound edge systems.  That way, any DSNs are sent within either my
>or the remote ADMD, but not across ADMD boundaries. ...

I meant that nobody sends positive DSNs.  You're right, we get lots of DSN bounces.

R's,
John


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John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
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