[Bug 297198] SPAMASSASSIN sa-learn can not learn mails exported to mbox format

[Thomas Arend]

https://bugs.kde.org/show_bug.cgi?id=297198

--- Comment #6 from Thomas Arend <thomas at arend-rhb.de> ---
Comment from Mark Martinec 2012-05-16 13:42:01 UTC from
https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6703#c6

> When saving messages with kmail 1 the From Line has following format
> which is not iaw RFC 822:
>   From info at ende-18-06.com Fri Jun 17 16:03:07 2011
> With kmail 2 the format is changed to the format which is iaw RFC 822
>   From thomas at arend-rhb.de Tue, 15 May 2012 22:01:41 +0200
> which is not parsed correctly by sa-learn. sa-learn --spam reports: [...]

Oh, no, not yet another incompatible mbox format!!!

> Proposed to change the behavior in a way that the old malformed From lines
> and the new correct ones are parsed.

It is the other way around, the new one differs from everybody else.

The format of the mbox file (along with its separator From_ lines)
is *not* governed by RFC 822 or its successors. There is no formal
standard for an mbox format, the RFC 4155 comes closest:
  http://tools.ietf.org/html/rfc4155
See also a Wikipedia article:
  http://en.wikipedia.org/wiki/Mbox


RFC 4155 says:

| a timestamp indicating the UTC date and time when the message
| was originally received, conformant with the syntax of the
| traditional UNIX 'ctime' output sans timezone (note that the
| use of UTC precludes the need for a timezone indicator);

This matches qmail docs:
  http://qmail.org/qmail-manual-html/man5/mbox.html
and matches Postfix and sendmail's local delivery agent.


To accommodate the new incompatible format it seems that the
two instances of a regexps in ArchiveIterator.pm need to be
extended, or just relaxed. Not sure if the date would still
be correctly parsed.

Best would be to persuade kmail folks to back off the change!

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