Currently, only CPU time is supported.

This conversion now includes a check that may fail. Pigeonhole currently only
uses this functionality to obtain an SMTP version of the postmaster address.
This code is now consolidated in the sieve_get_postmaster_smtp() function, which
provides postmaster address as an SMTP address.

Dovecot core doesn't have copyright notices in header files.

Now using struct smtp_address rather than sieve_address.
In some cases, struct message_address may prove to be more suitable, but this is the best fit for now.
Adjusted to the renamed fields in struct mail_deliver_context.

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.

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: Implemented support for writing runtime trace output to a directory if it exists, much like Dovecot rawlog.

Fixed a few printf format problems in the process.
Updated test suite to account for the new number width.

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.

This allows extension of test commands that evaluate the message somehow.
Currently this is implemented only for the message header.
Extensions can thereby influence what headers are evaluated and how.

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.

Doveadm-sieve plugin may be broken at this point; not tested so far.

Some environment items in the base specification are not (yet) applicable to Dovecot and are therefore not supported.

  - 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.

- Added sieve_global_extensions setting.