-$Cambridge: exim/doc/doc-txt/README.SIEVE,v 1.4 2005/05/03 10:02:27 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/README.SIEVE,v 1.6 2005/07/01 10:21:45 ph10 Exp $
Notes on the Sieve implementation for Exim
Exim Implementation
-The Exim Sieve implementation offers the core as defined by RFC 3028, the
-"envelope" (RFC 3028), the "fileinto" (RFC 3028), the "copy" (RFC 3894)
-and the "vacation" (draft-ietf-sieve-vacation-01.txt) extension,
+The Exim Sieve implementation offers the core as defined by RFC 3028bis,
+the "envelope" (RFC 3028), the "fileinto" (RFC 3028), the "copy" (RFC
+3894) and the "vacation" (draft-ietf-sieve-vacation-02.txt) extension,
the "i;ascii-numeric" comparator, but not the "reject" extension.
Exim does not support MDMs, so adding it just to the sieve filter makes
little sense.
correct, but its character set can not be converted to UTF-8.
-Address Test For Multiple Addresses Per Header
-
-A header may contain multiple addresses. RFC 3028 does not explicitly
-specify how to deal with them, but since the "address" test checks if
-anything matches anything else, matching one address suffices to
-satify the condition. That makes it impossible to test if a header
-contains a certain set of addresses and no more, but it is more logical
-than letting the test fail if the header contains an additional address
-besides the one the test checks for.
-
-
Semantics Of Keep
The keep command is equivalent to fileinto "inbox": It saves the
the Exim specification for details.
-Semantics of Redirect
-
-Sieve scripts are supposed to be interoperable between servers, so this
-implementation does not allow redirecting mail to unqualified addresses,
-because the domain would depend on the used system and on systems with
-virtual mail domains it is probably not what the user expects it to be.
-
-
String Arguments
There has been confusion if the string arguments to "require" are to be
-matched case-sensitive or not. This implementation matches them with
-the match type ":is" (default, see section 2.7.1) and the comparator
-"i;ascii-casemap" (default, see section 2.7.3). The RFC defines the
-command defaults clearly, so any different implementations violate RFC
-3028. The same is valid for comparator names, also specified as strings.
-
-
-Number Units
-
-There is a mistake in RFC 3028: The suffix G denotes gibi-, not tebibyte.
-The mistake os obvious, because RFC 3028 specifies G to denote 2^30
-(which is gibi, not tebi), and that's what this implementation uses as
-scaling factor for the suffix G.
+matched case-sensitive or not. The comparator default is case-insensitive
+comparison, but "require" does not allow to specify a comparator, so
+this default does not apply. Lacking a clear specification, matching
+the strings exactly makes most sense. The same is valid for comparator
+names, also specified as strings.
Sieve Syntax and Semantics
RFC 3028 confuses syntax and semantics sometimes. It uses a generic
grammar as syntax for actions and tests and performs many checks during
semantic analysis. Syntax is specified as grammar rule, semantics
-with natural language, despire the latter often talking about syntax.
+with natural language, despite the latter often talking about syntax.
The intention was to provide a framework for the syntax that describes
current commands as well as future extensions, and describing commands
-by semantics. Since the semantic analysis is not specified by formal
-rules, it is easy to get that phase wrong, as demonstrated by the mistake
-in RFC 3028 to forbid "elsif" being followed by "elsif" (which is allowed
-in Sieve, it's just not specified correctly).
+by semantics.
RFC 3028 does not define if semantic checks are strict (always treat
unknown extensions as errors) or lazy (treat unknown extensions as error,
Default Subject
-The draft specifies that the default message subject is "Re: "
-plus the old subject, stripped by any leading "Re: " strings.
-This string is to be taken literally, unlike some software which
-matches a regular expression like "[rR][eE]: *". Using this
-subject is dangerous, because many mailing lists verify addresses
-by sending a secret key in the subject of a message, asking to
-reply to the message for confirmation. Using the default vacation
-subject confirms any subscription request of this kind, allowing
-to subscribe a third party to any mailing list, either to annoy
-the user or to declare spam as legitimate mail by proving to
-use opt-in. The draft specifies to use "Re: " in front of the
-subject, but this implementation uses "Auto: ", as suggested in
-RFC 3834, section 3.1.5.
+The draft specifies that the default message subject is "Auto: " plus
+the old subject. Using this subject is dangerous, because many mailing
+lists verify addresses by sending a secret key in the subject of a
+message, asking to reply to the message for confirmation. Using the
+default vacation subject confirms any subscription request of this kind,
+allowing to subscribe a third party to any mailing list, either to annoy
+the user or to declare spam as legitimate mail by proving to use opt-in.
Rate Limiting Responses
The draft requires that each implementation offers a global black list
of addresses that will never be replied to. Exim offers this as option
"never_mail" in the autoreply transport.
-
-
-Interaction With Other Sieve Elements
-
-The draft describes the interaction with vacation, discard, keep,
-fileinto and redirect. It MUST describe compatibility with other
-actions, but doesn't. In this implementation, vacation is compatible
-with any other action.
git://git.exim.org / users / jgh / exim.git / blobdiff