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From: lear@turbo.bio.net (Eliot)
Newsgroups: comp.mail.misc
Subject: Re: Which headers may Sendmail re-write?
Message-ID: <Dec.15.16.03.39.1990.18214@turbo.bio.net>
Date: 16 Dec 90 00:03:39 GMT
References: <1990Dec14.064837.8996@Latour.Sandelman.OCUnix.On.Ca> <1990Dec14.174541.14252@Think.COM> <1990Dec14.233316.11292@chinet.chi.il.us> <1990Dec15.154618.7378@mp.cs.niu.edu>
Organization: GenBank Computing Resource for Mol. Biology
Lines: 47

rickert@mp.cs.niu.edu (Neil Rickert) claims the following:

> There is absolutely nothing in the protocols, or in the behavior of
>'sendmail' that would prevent you sending out your email as:

>From: les@chinet.uucp
>To: someone@somewhere

See RFC 1123 (in particular 5.2.18):

...
         o    Some systems fail to fully-qualify domain names in
              messages they generate.  The right-hand side of an "@"
              sign in a header address field MUST be a fully-qualified
              domain name.

              For example, some systems fail to fully-qualify the From:
              address; this prevents a "reply" command in the user
              interface from automatically constructing a return
              address.

              DISCUSSION:
                   Although RFC-822 allows the local use of abbreviated
                   domain names within a domain, the application of
                   RFC-822 in Internet mail does not allow this.  The
                   intent is that an Internet host must not send an SMTP
                   message header containing an abbreviated domain name
                   in an address field.  This allows the address fields
                   of the header to be passed without alteration across
                   the Internet, as required in Section 5.2.6.

>Date: 10 BC.
>From: les@chinet.uucp
>To: someone@somewhere
>Subject: Whatever you feel like.
...

> I guarantee that sendmail will not change the second set of
> 'headers'.

Unless you are claiming that in fact your headers are in the ext of
the message, this is all a matter of how one (mis)configures sendmail
through either the cf (many bad ones floating around, out there) or
through IDA, seismo, or other extensions.
-- 
Eliot Lear
[lear@turbo.bio.net]