https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6280
Summary: BAD_ENC_HEADER mistakenly identifies spam due to
invalid pattern
Product: Spamassassin
Version: unspecified
Platform: PC
OS/Version: FreeBSD
Status: NEW
Severity: minor
Priority: P5
Component: Rules
AssignedTo: dev@spamassassin.apache.org
ReportedBy: e...@eaglehouse.org
The rule for BAD_ENC_HEADER is currently defined:
header BAD_ENC_HEADER ALL =~ /=\?[^?\s]+\?[^?\s]\?\s*[^?]+\s(?!\?=)/
I suggest the correct pattern should be:
=\?[^?\s]+\?[^?\s]\?\s*.+?\?=
It fails on the following header because the pattern invalidly rejects RFC 2047
message header extensions, which doesn't mandate whitespace before the
terminating ?=. The rejected header was:
Subject: =?ISO-8859-1?Q?TeraStation Status Report:Infomation(Regular Report)?=
This subject line comes from a commercial program that I cannot fix. I know the
embedded spaces violate the RFC, but the SA pattern also wrongly requires a
whitespace character before the closing ?= delimiter.
I believe I have read the RFC correctly.
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