Re: [exim] Unknown Sender

On 11/10/05 7:33 PM, "Bill Hacker" <wbh@???> wrote:

> Marc Sherman wrote:
>
>> Marc Sherman wrote:
>>
>>> Robert Cates wrote:
>>>
>>>> OK, here they are (one of the differences is the @kormar.net (from
>>>> Outlook)
>>>> and @kormar.de (from Thunderbird) addresses, but I don't see where that
>>>> could matter)...
>>>
>>>
>>>
>>> I'll bet that's it, in fact. Try reconfiguring your outlook account
>>> to send as kormar.de, and vice-versa, and see what happens.
>>
>>
>> It's SPF. kormar.net has an SPF record, kormar.de does not.
>>
>> I'd eliminate the kormar.net SPF record, if I were you.
>>
>> - Marc
>>
>
> Could be much more basic than that, as previously stated.
>
> Note that T-Bird has supplied a message-id header.
> Outlook has not done so.

A few versions ago, some genius in Redmond seemingly decided that (a)
Outlook obviously would only be used with Exchange and (b) that the form of
Message-Id: which Outlook had been using was giving away information about
the internal network. So Outlook no longer does Message-Id: headers,
leaving it to Exchange to stick one on.

Exim's control=submission appeared at about that time.

Item (a) above is manifestly untrue. Item (b) above could likely have been
worked around by using a hash of the workstation's MAC address on the right
of the @ in the Message-Id. [The Microsoft of that time might well have
created a new, insecure hash mechanism and patented it.]

--John