Mail, SMTP headers and things like that

[Andrew Miehs <andrew@2sheds.de>]

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Dear List,

I am trying to find an official source for working out which mail  
headers are responsible for what. I am looking for somewhere  
describing the difference between "mail from:" and "from:" in the  
DATA section.

I would like to send mail from myself to a user - but if it bounces,  
I want that bounce to go back to 'postmaster@domain.com'.

Is doing what I have shown below supported? Reading the SPECs, It  
looks as if "Mail From:" and "From:" should be the same....

I am a little confused.

Thanks


Andrew




For example:

Standard SMTP session:

user@server:~$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 server.domain.com ESMTP Postfix (Debian/GNU)
helo world
250 server.domain.com
mail from:<postmaster@domain.com>
250 Ok
rcpt to:<hhhhh@someaddress.com>
250 Ok
data
354 End data with <CR><LF>.<CR><LF>
FROM: me@domain.com
SUBJECT: Test2
.
250 Ok: queued as 55DAC30696B


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