Watermarking, what does it actually consist of ...

[Matt Hampton]

>> The only problem I see is converting the date in to a unix time stamp...
>>     
>
> Well, maybe ... dont know yet.
>
> So .... just to make things clear ... its a MD5 hash ... converted to
> base64 ... and when it comes back into MailScanner again it
> recalculates the hash ... with the info from the mail ... and then
> compares the two string hashes ?
> Or am I totally lost here .. ?
>
>   
Yes exactly right - the Date is calculated from the Date field *NOT* the 
system date. 

The header is actually

X-MailScanner-Watermark: 1213961026.89637 at zP9SzydkvnIBOgx58U4azQ


where the number before the @ is the expiry of the token.

matt