Re: [Mimedefang] Anti-spam breakthrough from Roaring Penguin

2017-04-05 Thread Richard Laager 
On 04/05/2017 04:20 AM, Jan-Pieter Cornet wrote:
> Funny thing is, this method of both accepting AND rejecting

Speaking of both accepting and rejecting...

On a serious note, I wonder if anyone has built this:

if (greylisting says to tempfail)
{
# add a header, such that this message will be delivered to the
# user's Junk folder

resend_message();

# store some data so we can find the message later

action_tempfail();
}
else
{
if (we accepted this message before)
{
# reach out to Dovecot, move the message from Junk to Inbox
# (possibly if and only if it is still unread)

action_discard();
}
}

This pseudo-code assumes stream_by_recipient() or enhancements for users
with different filtering preferences. This also requires greylisting to
happen at DATA, not RCPT.


We would accept the message (but deliver it to the Junk folder) while
reporting a tempfail to the sender. If the sender retries correctly, we
move the message from Junk into Inbox.

This means my Inbox gets all the advantages of greylisting. I also get
every message delivered immediately; if I need a "password reset" email
or something from a new sender on the phone, I can look in my Junk folder.

-- 
Richard



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Re: [Mimedefang] Anti-spam breakthrough from Roaring Penguin

2017-04-05 Thread Dianne Skoll 
On Wed, 5 Apr 2017 11:20:47 +0200
Jan-Pieter Cornet  wrote:

> Funny thing is, this method of both accepting AND rejecting is
> actually observed in practice :)

This is my bible: 
https://www.amazon.ca/Truth-Comedy-Improvisation-Charna-Halpern/dp/1566080037

:)

Regards,

Dianne.


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Re: [Mimedefang] Anti-spam breakthrough from Roaring Penguin

2017-04-05 Thread Jan-Pieter Cornet 
> On April 1, 2017 12:17:25 AM EDT, Dianne Skoll  
> wrote:
>> I'm proud to announce that our Roaring Penguin research staff have made
>> a historical breakthrough in spam filtering.  Please see our video
>> about
>> our new technology, Quantum Spam Filtering:
>>
>> https://www.youtube.com/watch?v=koRRqOJcaHs

Funny thing is, this method of both accepting AND rejecting is actually 
observed in practice :)

There are a number of trap hosts that reject a message after data, AND send the 
received mail back to the sender's network as spam feedback. Quite useful.

-- 
Jan-Pieter Cornet 
Systeembeheer XS4ALL Internet bv
www.xs4all.nl



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