Re: [Fwd: [Asrg] Re: Documents for LMAP BOF]

Hadmut Danisch wrote:
> On Sun, Feb 08, 2004 at 02:41:20PM -0500, Yakov Shafranovich wrote:
> 
>>So basically there are:
>>1. IP address of the MTA.
>>2. Information about the sender.
> 
> ? What exactly does "Information about the sender" mean?
> Do we know anything except the IP address? Or does this
> mean the mail address the sender wishes to use? 

Well actuall we have IP address of the MTA, HELO parameter used by the 
MTA, and MAIL FROM/From headers used by the sender. So I am refering to 
the MAIL FROM and "from" header information.

>>There are two types of authorization possibilities here:
>>1. Whether the incoming IP is authorized to be an MTA.
>>2. Whether the incoming IP is authorized to use the domain.
>>
>>I do not see a third identifier, perhaps you can elaborate?
> 
> 1. The IP address as a verified identifier for the caller
> 
> 2. The mail address / helo name the caller wishes to use
> 

Isn't the HELO name unique to the MTA as opposed for the MAIL FROM 
address which is unique to the sender? It is feasible that an MTA might 
want to do multiple mail transaction in one SMTP connection using one 
HELO identifier.

> 3. A lookup key calculated from 1 and 2. It depends on the 
>    IP address and mail address as parameters and on what 
>    we like to define as a conversion function.
> 
>    This is more to be theoretically precise and to do exact
>    engineering. You can't use the mail address to perform a lookup
>    directly. 
> 
>    The current function would be: Take the domain part and prepend it 
>    with _lmap or whatever. 
> 
>    But from my point of view it is important to take and treat this 
>    as an explicit conversion function, even if it might be trivial 
>    at the moment.
> 

K.

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Yakov Shafranovich / asrg <at> shaftek.org
SolidMatrix Technologies, Inc. / research <at> solidmatrix.com
"But in this world nothing can be said to be certain, except death and 
taxes" (Benjamin Franklin)
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