Milter-greylist

Hi,

The headers you are referring to are transferred at the stage later than
the greylisting is happening thus are not possible to be used.

For your ideas to work milter-greylist would have to work throughout the
SMTP transaction, wait until the DATA stage is over and only then
respond with a temporary failure, which is an "expensive" process and
IMHO would defeat the "cheapness" of the current implementation.

Best regards,

Ranko

On Tue, 2006-11-21 at 11:15 +0100, Christian PELISSIER wrote:
> Some ideas for the next milter-greylist release.
> 
> Idea one
> ========
> Some users complains sometimes about greylisting delays.
> Milter-greylist
> allow many
> ways to satisfy them but it needs to modify greylist.conf and restart.
> 
> So a good (or a bad) idea could be to give the senders some control on
> the delay
> by adapting the waiting time (option -w) according to the X-Priority
> header (needs to inform senders to be efficient) of icoming mails.
> 
> Thunderbird allow us to define the following priorities :
> 
> X-Priority: 1 (Highest)
> X-Priority: 2 (High)
> X-Priority: 3 (Normal)
> X-Priority: 4 (Low)
> X-Priority: 5 (Lowest)
> 
> MicroSoft use 
> 
> X-MSMail-Priority: High
> X-MSMail-Priority: Normal
> X-MSMail-Priority: ...
> ...
> 
> So having in greylist.conf
> 
> greylist 15m
> 
> and take care of priority with 
> 
> priority_highest -13m
> priority_high -10m
> priority_normal +0
> priority_low +45m
> priority_lowest +4h
> 
> (I dont know if it's better to give relative or absolute value)
> 
> Idea Two
> ========
> 
> Many spam come now as a gif, jpeg or png containing text. If we apply
> the same idea as above delaying longer by adding a new delay to the
> previous one when a mail come with attachements
> 
> ct_gif_add 1h
> ct_jpeg_add 30m
> ct_png_add 5m
> ct_htm_add 5m
> ct_doc_add 5m
> 
> It needs to scan the body searching for :
> 
> Content-Type: image/gif
> Content-Type: image/jpeg
> etc.
> 
> 
> 
> 
>  
-- 
Ranko Zivojnovic
IT Director/CTO          

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