Re: .mailfilter file stopped working with 2.7.1

Sam Varshavchik <[email protected]> Thu, 16 Jan 2014 18:02:06 -0500
Newsgroups	gmane.mail.maildrop
Message-ID	<[email protected]>
Nerijus Baliunas writes:

> On Thu, 16 Jan 2014 13:42:11 +0200 Nerijus Baliunas  
> <[email protected]> wrote:
>
> > Does not work:
> > if (/^From: *"System Anti-Virus Administrator" <[email protected]>/)
> > to "./Maildir/.avirus"
> >
> > Works:
> > if (/^From: *System Anti-Virus Administrator <[email protected]>/)
> > to "./Maildir/.avirus"
>
> And with 2.6.0 it's vice versa - works with quotes and does not work without.
> The raw header line in the message is:
>
> From: "System Anti-Virus Administrator" <[email protected]>

Ok. This is a result of the switch to canonical UTF-8 pattern matching. The  
message gets transcoded to a canonical UTF-8 format, internally, before it  
gets searched. This involves converting all headers to a canonical format.  
As part of this process, all headers get reparsed and reformatted. Message  
text encoded with quoted-printable or base64 gets decoded. Before the switch  
to UTF-8, it was not really possible to search base64-encoded content, so  
this was a pretty big deal.

In the case here, the quotes are redundant, so they're removed before the  
actual search takes place. So now, the same search pattern will match a  
From: header with or without quotes, around the names. It should also match  
a From: header that uses obsolete syntax, like "From: [email protected] (System  
Anti-Virus Administrator)", using the same pattern.

You can see what exactly gets searched by executing "reformime -u" with the  
message on standard input.

I agree that this is confusing, but this is the right thing to do. Being  
able to correctly match non-Latin search patterns is more important. So, the  
only result from this, is that better documentation is needed. Generally,  
the patterns should be written against the output from reformime -u.

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