Update to 0.4.16.

• Part of the Sieve extprograms implementation was moved to Dovecot, which means that this release depends on Dovecot v2.2.26+.
• ManageSieve: The PUTSCRIPT command now allows uploading empty Sieve scripts. There was really no good reason to disallow doing that.

+ Sieve vnd.dovecot.report extension:

+ Added a Dovecot-Reporting-User field to the report body, which
  contains the e-mail address of the user sending the report.
+ Added support for configuring the "From:" address used in the
  report.

+ LDA sieve plugin: Implemented support for a "discard script" that is

run when the message is going to be discarded. This allows doing
something other than throwing the message away for good.

+ Sieve vnd.dovecot.environment extension: Added vnd.dovecot.config.*

environment items. These environment items map to sieve_env_*
settings from the plugin {} section in the configuration. Such values
can of course also  be returned from userdb.

+ Sieve vacation extension: Use the Microsoft X-Auto-Response-Suppress

header to prevent unwanted responses from and to (older) Microsoft
products.

+ ManageSieve: Added rawlog_dir setting to store ManageSieve traffic

logs. This replaces at least partially the rawlog plugin (mimics
similar IMAP/POP3 change).

• doveadm sieve plugin: synchronization: Prevent setting file timestamps to unix epoch time. This occurred when Dovecot passed the timestamp as 'unknown' during synchronization.
• Sieve exprograms plugin: Fixed spurious '+' sometimes returned at the end of socket-based program output.
• imapsieve plugin: Fixed crash occurring in specific situations.

PR: 213926
Submitted by: maintainer (Larry Rosenman)