Re: [exim] BCC Leakage

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Autor: Marc Perkel
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A: exim-users
Assumpte: Re: [exim] BCC Leakage


Eli wrote:

>Marc Perkel said,
>
>
>
>>I just had an interesting spam get through. It had exactly 10,000 bcc:
>>lines and the bcc was exposed. I don't know what the limit is - but this
>>spammer found it. Apparently at some point the bcc lists make it through.
>>
>>
>
>10000 individual Bcc: headers? Or 10000 recipients in one Bcc: header?
>
>Besides that question, I believe there have been discussions before about
>who should remove the Bcc: headers in a message - the sending MTA, or the
>receiving MTA. If I'm not mistaken, it was supposedly said that the sending
>MTA should be the one responsible for removing the Bcc: header in a message
>once sending it to it's destination. This would mean that if some joe
>spammer sends a message and includes a Bcc: header, it's not going to be
>stripped from the message by Exim.
>
>I could be totally wrong though - I'm going off memory from a while back,
>and also based on a situation where a client of mine complained about seeing
>a Bcc: header in a message that was sent to an Exim system.
>
>Eli.
>
>
>
>
>

It was 10,000 in one giane bcc header. I posted this in case it was a
bug in Exim where some new limit has been reached.

BTW - what is the command in the ACL to limit the bumber of recipents?
How do I block this?

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