Re: Spam filtering on the mailing lists

On Thu, Jul 17, 2008 at 12:01:08AM -0300, Marc G. Fournier wrote:

> Does anyone know if there is some 'rule' that return mail about 'Undeliverable'
> has to be in English?

Nope, there isn't. The bounce message is intended for human
consumption, and therefore localisation is approproate.

Note, however, that many of the messages should have a Content-Type:
multipart/report; report-type=delivery-status; header. See RFC 3462,
which obsoletes RFC 1892.

RFC 3462 requires a machine-parsable delivery report, and one such
report is defined in RFC 3464. Many mail systems (most?) conform to
this these days, so just detecting thatt here is a delivery-status
header, then parsing the second body-part for "^Action: failed" oughta
work. The message/delivery-status content-type MUST be 7 bit, so you
can be relatively certain it's not going to be anything but ASCII.
(AFAIK, there are no machines left on the Internet that leak 7-bit
charsets that are not ASCII).

A

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