Re: incoming mail without information in the from, to, subject fields

From: Barry Margolin (barmar_at_alum.mit.edu)
Date: 04/21/04 

Date: Wed, 21 Apr 2004 11:06:20 -0400

In article <V%phc.33$tO6.19@newsfe1-win>,
 "Hairy One Kenobi" <abuse@[127.0.0.1]> wrote:

> "Kevin Rodgers" <ihs_4664@yahoo.com> wrote in message
> news:40855ABE.9030204@yahoo.com...
> > Alan Connor wrote:
>
> > > I tried that and got a "From " header with the address in the "mail
> from:<.*>
> > > header. No other headers, but that one for sure. Tried twice.
> >
> > The "From " line is not a message header, it is a delimiter specific to
> > the Unix mbox file format that is added by the MTA (e.g. sendmail or
> > procmail). Other file formats like MMDF use different delimiters.
> >
> > RFC 822 specifies that a "From:" header is required in the message itself.
>
> Erm.. 822 specifies what a From: header /is/, and how it's formatted. RFC

It also lists the headers that are required, and "From:" is one of them.

> 821 (SMTP, what we're talking about ;o) specifies where a blank From: is
> actually recommended..
>
> (Hint: mails where failures should not be reported)

RFC 821 refers to the address used in the "MAIL FROM" command, not the
"From:" header. This address, generally called the "envelope sender",
ends up in the "Return-Path:" header during final delivery. 

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA

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