Re: [exim] Sender verification

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Author: Wolfgang Hennerbichler
Date:  
To: David Woodhouse
CC: exim-users
Subject: Re: [exim] Sender verification

On 30.08.2007, at 02:31, David Woodhouse wrote:

> On Wed, 2007-08-29 at 12:08 +0100, David Woodhouse wrote:
>> On Tue, 2007-08-28 at 22:45 +0200, Wolfgang Hennerbichler wrote:
>>>
>>> helo mail.domain.name
>>> MAIL FROM:<"NokiaNiedersch\366neweidewlole"@???>
>>>
>>> The local part of the sender address is obviously "broken",
>>
>> That isn't obvious to me.
>
> Actually, I think you're right, although perhaps not for the
> reasons you
> originally thought.


:)

> So since your example actually seems to have contained the byte 0xF6
> (the \366 is presumably a representation of that, rather than being a
> literal '\' '3' '6' '6', you probably _can_ declare that it's
> obviously
> broken on syntactic grounds.


It really was a umlaut, I just switched to an UTF8-enabled terminal,  
and voila:
35h   22K 1IQ5fZ-00085v-Km <> *** frozen ***
           "Büchlerqgytc"@???


34h   18K 1IQ6tP-0001X6-WF <> *** frozen ***
           "NokiaNiederschöneweidewlole"@???


15h   18K 1IQOqb-0004Rv-98 <> *** frozen ***
           "PlenkPlänterwaldmety"@???



> I'm surprised Exim's SMTP syntax checks
> didn't catch that -- unless it really was a backslash and three
> digits?


Those messages are frozen because they have been bounced from the
remote MTA. I'll try to figure out a way to block these sender
adresses. Thanks for your help digging into the RFC's (I should
actually have done that before asking).

> --
> dwmw2


wogri

--
wogri@???
http://www.wogri.com
http://www.einradfilm.at