[ic] [interchange-core] Encoding of mail headers

[Stefan Hornburg]

David Christensen wrote:
> On Mar 4, 2009, at 9:27 AM, Stefan Hornburg wrote:
> 
>> David Christensen wrote:
>>> On Mar 4, 2009, at 2:52 AM, Stefan Hornburg (Racke) wrote:
>>>
>>>> According to RFC 2047 mail headers with characters other than US-
>>>> ASCII needs
>>>> to be escaped. Interchange fails to do so, resulting in emails
>>>> delivered
>>>> which will be tagged by Spamassassin with SUBJECT_NEEDS_ENCODING and
>>>> SUBJ_ILLEGAL_CHARS.
>>>>
>>>> I wrote a simple filter which addresses this problem:
>>>>
>>>> CodeDef mime_encode_words Filter
>>>> CodeDef mime_encode_words Description Find MIME type of filename
>>>> CodeDef mime_encode_words Routine <<EOR
>>>>
>>>> use MIME::EncWords;
>>>>
>>>> sub {
>>>> 	return MIME::EncWords::encode_mimewords(shift);
>>>> }
>>>> EOR
>>>>
>>>> Of course the whole IC email infrastructure needs to be adjusted to
>>>> use
>>>> this.
>>> The Encode module also offers this capability, and has the benefit of
>>> being core.  While we're doing this, we should revisit the body
>>> encoding as well.  I definitely agree that this should be done.
>>>
>> How would this work with Encode?
>>
>> Regards
>> 	Racke
> 
> 
> use Encode qw(encode);
> 
> sub mime_encode_header {
>      return encode('MIME-Header',shift);
> }
> 

In addition to Mike's concern, it doesn't emit a header which Thunderbird 
displays correctly:

MIME:EncWords:
Subject: =?ISO-8859-1?Q?Bestellbest=C3=A4tigung?= F-Shop

Encode:
Subject: =?UTF-8?B?QmVzdGVsbGJlc3TDg8KkdGlndW5nIEYtU2hvcA==?=

Even with UTF-8 the ASCII characters should be legible.

Regards
	Racke

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