Am 29.07.2015 um 23:34 schrieb John Hardin:
On Wed, 29 Jul 2015, Paul Stead wrote:

On 29/07/15 18:11, Benny Pedersen wrote:

 Henrik krohn did create a emailbl.pl but it was droppede later, it Was
 designede very well, i have tryed Google it, but seems impossible to
 get links to it now.

I have got a copy of Henrik's code - I'm not sure on the procedure about
uploading this.

The essential formula is

strtolower(md5(<email>)).<blacklistaddress>

Is the chance of collision introduced by that strtolower() acceptable in
this application?

besides that it was corrected - the strtolower needs to be inside the md5 - which collissions? you want a mail-address matching independent of y...@example.com or y...@example.com, otherwise a spammer would trick you with mybadadr...@example.com

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