Upgrade mail/dovecot2-pigeonhole to 0.4.18.
iChangelog v0.4.18:
+ imapsieve plugin: Implemented the copy_source_after rule action. When
this is enabled for a mailbox rule, the specified Sieve script is executed for the message in the source mailbox during a "COPY" event. This happens only after the Sieve script that is executed for the corresponding message in the destination mailbox finishes running successfully.
+ imapsieve plugin: Added non-standard Sieve environment items for the
source and destination mailbox.
- multiscript: The execution of the discard script had an implicit "keep", rather than an implicit "discard".
Approved by: (adamw|rene): (mentor)