Next (in order of descending priority/precedence):
* Fix standards compliance issues:
	- Body: contains various bugs that need to be resolved for standards
	  compliance.
	- 'If an address is not syntactically valid, then it will not be matched
	  by tests specifying ":localpart" or ":domain"'.
* Fix security issues:
	- Impose limitations on the imapflags extension regarding the number of
	  set flags and the length of each flag name.
	- Malicious/Broken binary can allocate large variable storage
* Finish the test suite for the base functionality
* Improve debugging and error handling:
	- Improve byte code dumping and trace functionality to be a little more 
  	  user-friendly
	- Improve argument errors
* Make sure cmusieve can be replaced seamlessly with the new plugin.
* Fix/Report issues listed in 'doc/rfc/RFC Controversy.txt'

* ## MAKE A FIRST RELEASE (0.1.x) ##

* Fix remaining (mostly variables-related) RFC deviations:
	- Allow for the existance of dynamic comparators (i.e. specified by 
	  variables). 
	- Allow for dynamic includes (i.e. specified by variables).
	- Allow for :regex matching with variable key.
	- Detect assignment of too large constant values to variables at runtime.
	- Verify outgoing mail addresses at runtime when necessary
	  (e.g. after variables substitution)
	- Vacation: the ":subject" parameter specifies a subject line to attach to 
	  any vacation response that is generated. UTF-8 characters can be used in
	  the string argument; implementations MUST convert the string to [RFC2047]
 	  encoded words if and only if non-ASCII characters are present.
	- Vacation: properly implement construction of a References header from
	  the original message.
* Imapflags: merge execution of setflags, removeflags and addflags into one 
  common implementation. 
* Warn about the use of syntactically invalid header names. 
* Implement notify extension with sole support for mailto mechanism. 
* Implement dropping errors in the user's mailbox as a mail message.
* Add normalize() method to comparators to normalize the string before matching
  (for efficiency).
* Make this implementation conform section 2.7.2 of RFC3028 (Comparisons Across
  Character Sets). 
* Implement comparator-i;unicode-casemap
* Implement executing an arbitrary number of scripts sequentially, acting on the 
  same set of result actions (multiscript).
* Implement environment extension
* Make testsuite much more exhaustive and add support for testing the actual
  result.

* Build a sieve tool to filter an entire existing mailbox through a sieve script.
* Build a server with test mail accounts that processes lots and lots of mail 
  (e.g. spam, mailing lists etc.)

* ## MAKE A SECOND RELEASE (0.2.x) ##

* Provide a solution for mail_get_headers_utf8 reparsing the whole message each
  time it is called (header and address test; Timo might provide solution from
  within Dovecot)
* Implement date and index extensions
* Optimize code containing true/false tests to omit explicit JMP opcodes
  (i.e. optimize the test away and any code that negatively depends on it)
* Use lib/str-find.h for :contains and :matches match types  

* Add development documentation, i.e. comment on library functions and document
  the binary and byte-code format. 
* Make the engine and its extensions much more configurable. Possibly this can 
  be merged with Dovecot's new master config implementation.
* Implement editheader extension
* Implement mimeloop extension
* Give the byte code format some more thought, it is currently quite rough and
  to the point. 
* Try to implement proposed notify mechanisms other than mailto. Currently: xmpp
  and sip
* Implement namespace support for variables extension 
  (possibly needed by test suite; in that case priority is much higher)