Dovecot Sieve and Postfix header_checks Issue

[Alex Crow]

On 26/09/14 16:00, Klaipedaville on Google wrote:
> >So why does it state in man 5 regexp_table that such tables are *case 
> insensitive* by default and the /i actually toggles that? Are you 
> saying that man page is wrong? I'd be surprised as I don't think I've 
> yet come
> >across an occasion where postfix man pages are incorrect!
> I am not saying that the Postfix man is incorrect. It is 100% case 
> insensitive and SPAM (upper case) and spam (lower case) would mean 
> absolutely the same. Therefore my SPAM (upper case) regexp was correct.
>
> >So if the regexes were all correct, then:
> >
> >a) what was your actual problem once you identified it
> >
> >and
> >
> >b) for the benefit of the list, how did you actually solve it?
> >
> >Alex
>
> I explained it all in my previous post.

I realise it's probably because of the use of the reject action, which 
presumably inserts the text "No spamming allowed here." into the subject 
of the bounce.

However what also concerns me is that sending MDN's back to the envelope 
sender of SPAM messages is very likely to cause your server to be the 
origin of "Joe-Job" spam. The sieve RFCs state that if using reject 
(therefore sending MDNs) you should also be able to check for forged 
envelope senders and in that case do not send bounces. In real life it's 
considered best to just not bother sending anything back at all, and 
either discard, or block at the SMTP level using RBLs.

Cheers

Alex




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