Correct header for \"%\" hack

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2 total messages Started by Kevin Crowston Mon, 25 Nov 1985 18:25

#35

Author: Kevin Crowston
Date: Mon, 25 Nov 1985 18:25

41 lines
2106 bytes

I'm trying to write an SMTP server for our local
network and have a question about return addresses.

The machine that hosts the SMTP server is registered with the local
domain server, but not with the NIC, (a situation that is unlikely to
change in the near future due to some political problems here).
We can receive mail using the "%" hack, by sending it first to a local
machine that is registered with the NIC and which does the domain
trick and sends it on to us.

My question is, what should I put in the headers of our outgoing mail?
Currently I use person%localhost@arpahost in both the header and in
the SMTP dialogue (ie. I send MAIL FROM:<person%local@arpa>).  Is this
okay?  It seems to give slightly weird headers in the received mail; I
get both a From: line and a From_: line, the first of which lists the
arpa host twice (I think an example will be clearest:

    From :kevin%MIT-SLOAN.MIT.EDU@MIT-MC.ARPA@MIT-MC.ARPA Mon Nov 25 12:19:42 1985
    Received: from MIT-SLOAN.MIT.EDU by MIT-MC.ARPA 25 Nov 85 12:19:32 EST
    Received: from MITMS1-E52: by MIT-SLOAN.MIT.EDU; 25-Nov-85 12:19:32
    Message-Id: <531756324.262448728@MIT-SLOAN.MIT.EDU>
    From: kevin%MIT-SLOAN.MIT.EDU@MIT-MC.ARPA
    To: kevin@harvard.ARPA
    Subject: This is a test
    Sender: 
    Date: 25 Nov 85 12:18
    Status: R

    This is a brief example.

    Kevin

Any suggestions about the "right" thing to do will be greatly
appreciated.  

Kevin Crowston
MIT Sloan School of Management

kevin%mit-sloan.mit.edu@mit-mc.arpa
kevin@harvard.arpa

Re: Correct header for \"%\" hack

#39

Author: zben
Date: Tue, 26 Nov 1985 15:37

34 lines
2281 bytes

In article <48@brl-tgr.ARPA> kevin@harvard.ARPA (Kevin Crowston) writes:

>Currently I use person%localhost@arpahost in both the header and in
>the SMTP dialogue (ie. I send MAIL FROM:<person%local@arpa>).  Is this
>okay?  It seems to give slightly weird headers in the received mail; I
>get both a From: line and a From_: line, the first of which lists the
>arpa host twice (I think an example will be clearest:
>
>    From_:kevin%MIT-SLOAN.MIT.EDU@MIT-MC.ARPA@MIT-MC.ARPA Mon Nov 25 12:19:42 
>    From: kevin%MIT-SLOAN.MIT.EDU@MIT-MC.ARPA

You probably do *NOT* want to put the hacked version into the SMTP dialog.
What is happening is that the ARPA host is also adding its name to the path,
so you end up with two copies.  If you just put "person@local" into the
dialog, MIT-MC.ARPA should create one of the two following forms:

     person%local@MIT-MC.ARPA
     @MIT-MC.ARPA:person@local

which is (I believe) the right thing to do.  Note also that many people use
the buzzword 'Out-Of-Band' to refer to the data in the SMTP dialog, since it
is not part of the message text (In-Band) information.

As to the headers.  If MIT-MC is "munging" headers, you do not want to put
the hack there.  This seems to be the case from the information you gave.

So you probably do not want to put the hack in at all.  If software everywhere
is working correctly, you do not need to.  Don't treat this as gospel from on
high though - experiment and use whatever seems to work correctly in all cases.

Ben Cranston
POSTMASTER@UMD2
-- 
Ben Cranston  ...{seismo!umcp-cs,ihnp4!rlgvax}!cvl!umd5!zben  zben@umd2.ARPA

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