Currently, only CPU time is supported.

It adds the ability to manually invoke Sieve filtering in IMAP.

For accounts that perform many redirects, the lda-dupes database could grow to impractical sizes.
Changed the default retention period from 24 to 12 hours.

LDA Sieve plugin: Implemented support for a "discard script" that is run when the message is going to be discarded.

This adds a new "sieve_discard" setting that points to the location of the "discard script".
Once the normal scripts finish executing and the result is that the message will be discarded without being delivered anywhere, the "discard script" is executed.
The discard script can prevent dropping the message, by executing alternative actions.
If the discard script does nothing, the message is still discarded.

A "vnd.dovecot.config.<identifier>" environment item maps to the content of the matching sieve_env_<identifier> plugin setting.

This is used mainly when no other means of obtaining the user's email is available, such as when there is no envelope (in IMAP).
Before, the postmaster address or the null "<>" address was used as a fallback for sending messages.
The redirect and enotify commands can be explicitly configured to use what is configured with sieve_user_email.

lib-sieve: Created generic implementation for parsing an envelope_from setting, such as sieve_redirect_envelope_from.
Also adds a new source for the envelope_from address called "postmaster". This means that the value is obtained from the postmaster_address LDA setting.

Using a location option for the default name makes no sense if its only used for the main personal script.

lib-sieve: storage: Implemented magic to make sieve_default script visible in main storage (e.g. from ManageSieve).

Forgot to adjust a few things when the location types were introduced and documented.

lib-sieve: Implemented sieve_redirect_envelope_from setting, which allows configuring the envelope sender of redirected messages.
Can either be set to the envelope sender, recipient, or orignal recipient of the processed message or it can be set explicitly to a static address.

It is still a plugin, but no longer a separate package.

Incorporated sieve_duplicate plugin into main Pigeonhole tree as a normal extension (vnd.dovecot.duplicate).
Also restructured doc dir a bit in the process.

Additional paths are specified by adding a sequence number (starting at 2) to the setting name.
Added support for specifying home-relative paths for sieve_before and sieve_after.
This enables administrators to specify user-specific global Sieve scripts that cannot be viewed or changed by virtual users.

  - Built generic interface for alternative script sources.
  - Implemented dict script location.
  NOTE: ManageSieve will not work with this yet, nor will sieve_before/sieve_after.

Old name is now deprecated.
Support for the even older global_script_path name for this setting is dropped.

Setting sieve_max_redirects=0 now means that redirects are prohibited rather than unlimited.
Now there is always a limit, but it can be enormous if the administrator wants to.

- Added sieve_global_extensions setting.

- Updated documentation.
- Made editheader extension disabled by default

Vacation extension: added min/max period configuration settings and changed the internal unit from days to seconds.