Comment 3 for bug 264306

I've reproduced the bugs with a minimal dovecot.conf and sieve.conf as follows:

dovecot.conf:
# Base directory where to store runtime data.
base_dir = /tmp/dovecot-264306
protocols =
mail_location = maildir:/tmp/dovecot-264306/mail

protocol lda {
    postmaster_address =
    log_path = /tmp/dovecot-264306/mail.log
 mail_plugins = cmusieve
}

plugin {
 sieve = /tmp/dovecot-264306/sieve.conf
}

sieve.conf:
if header :contains "Subject" "blahblahblah" { discard; }