Re: [AMaViS-user] any reason

boricua,

> any reason for not discarding bad header.
> today is 95% of the spam i get
>
> X-Amavis-Alert: BAD HEADER Improper folded header field made up entirely of
> whitespace in message header 'X-Spam-Report': \t

Sure, in most cases mail with such headers can be discarded.

> any good reason why this is not a default?

Because such header is actually valid in rfc822. The rfc2822 prohibits
it, but recognizes that old clients (or broken mail clients) may still use it:

4.2. Obsolete folding white space
In the obsolete syntax, any amount of folding white space MAY be
inserted where the obs-FWS rule is allowed. This creates the
possibility of having two consecutive "folds" in a line, and
therefore the possibility that a line which makes up a folded header
field could be composed entirely of white space.


Note that newer versions of amavisd-new remove such lines to protect
poorly written mail clients from misinterpreting mail header:

amavisd-new-2.3.1 release notes

- unfold obsolete-syntax folded header fields composed entirely of
white space (RFC 2822 section 4.2); suggested by Ian Abbott and others.
Note that such unfolding breaks DomainKeys "simple" canonicalization
algorithm (but is transparent to "nofws") if the affected header is
included in the signature;

Mark


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