Watermarking and spoofed sender

[Adam Laye]

On Wed, Mar 20, 2013 at 5:00 AM, <mailscanner-request at lists.mailscanner.info
> wrote:

> Send MailScanner mailing list submissions to
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> water marking and SPAM,



> I am not sure that water marking will be of any use to your here. However
> you can preven distribution groups from recieving external mail via
> settings in Active directory Users and Computers. This would auto reject
> Email sent to a group if the souce was External. ... Not sure this fits
> your sittuation, good luck.
>



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> Today's Topics:
>
>    1. Re: Symbolic link? (Martin Hepworth)
>    2. Watermarking and spoofed sender address (Robert Lopez)
>
>
> ---------- Forwarded message ----------
> From: Martin Hepworth <maxsec at gmail.com>
> To: MailScanner discussion <mailscanner at lists.mailscanner.info>
> Cc:
> Date: Tue, 19 Mar 2013 12:39:44 +0000
> Subject: Re: Symbolic link?
> set it properly - has been known to cause some issues in the past with
> various MTAs
>
> --
> Martin Hepworth, CISSP
> Oxford, UK
>
>
> On 19 March 2013 08:49, Bjørn T Johansen <btj at havleik.no> wrote:
>
>> I moved /var/spool/MailScanner to a different disk and now I see this in
>> the log when starting MailScanner..:
>>
>>
>> Your "Incoming Work Directory" should be specified as an absolute path,
>> not including any links. But I will work okay anyway.
>>
>>
>> Can I just ignore this or should I change the Incoming Work Directory
>> path?
>>
>>
>> Regards,
>>
>> BTJ
>>
>> --
>>
>> -----------------------------------------------------------------------------------------------
>> Bjørn T Johansen
>>
>> btj at havleik.no
>>
>> -----------------------------------------------------------------------------------------------
>> Someone wrote:
>> "I understand that if you play a Windows CD backwards you hear strange
>> Satanic messages"
>> To which someone replied:
>> "It's even worse than that; play it forwards and it installs Windows"
>>
>> -----------------------------------------------------------------------------------------------
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>
>
>
> ---------- Forwarded message ----------
> From: Robert Lopez <rlopezcnm at gmail.com>
> To: MailScanner discussion <mailscanner at lists.mailscanner.info>
> Cc:
> Date: Tue, 19 Mar 2013 17:57:38 -0600
> Subject: Watermarking and spoofed sender address
> I understand watermarking is to defend against "joe job blowback". I think
> I understand that blowback problem is when email is sent, using for example
> my address, to many other domains and all the flack (blow back) comes back
> to me.
>
> I am wondering if this watermarking is of any use in a type of SPAM we now
> frequently see. It is where email is sent to a list of addresses, all at
> our domain, and the from address is also the first address in the address
> list. Everyone else thinks the first person sent it. Our gateways send such
> email to Exchange and any communication back to the sender is entirely
> within Exchange and never comes back through the gateways again.
>
> In this kind of SPAM I have always considered it of no use. Am I wrong in
> my thinking?
>
> --
> Robert Lopez
> Unix Systems Administrator
> Central New Mexico Community College (CNM)
> 525 Buena Vista SE
> Albuquerque, New Mexico 87106
>
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