Dovecot Sieve and Postfix header_checks Issue

[Alex Crow]

On 27/09/14 11:49, Klaipedaville on Google wrote:
>> Joseph Tam writes:
>>
>> However, my header_checks file has just 5 lines of regexp as follows:
>> ...
>> /^From:.*\@.*\.tw/                       REJECT Sorry, Taiwanese mail is not allowed.
>>
>> Can't speak about the other issues you are having, but is this regexp pattern what you want?  Unless Postfix PCRE automatically right-anchors these regexps, aren't you rejecting mail from someone at mail.twinpeaks.org,
>> or even twitter notifications (from *@bounce.twitter.com).
> I am not sure I even understand what you were trying to say. It's either because you have no idea how to write any regexp / pcre rules

I don't understand why you seem to think there is some kind of magical 
interaction between postfix and dovecot. Once postfix passes to the 
Dovecot LDA that's the end of its responsibility. Likewise dovecot has 
no inside knowledge of that Postfix does.

Certainly in grep that /would/ match ,eg, foo at bar.twister.com because as 
Joseph said the .tw is not anchored to the end of the pattern. Now 
whether this applies in headerchecks is not for this list.

if it was

^From:.*\@.*\.tw$

it would not.

And again according to the man page, $ is usable:

"/^(.*)-outgoing@(.*)$/"

You seem to think that you are the worlds greatest regexp expert and to 
be frank it comes off as a bit arrogant.

Alex