This file is indexed.

/etc/pam.d/sieve is in cyrus-common 2.5.10-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# PAM configuration file for Cyrus SIEVE timsieved service
#
# If you want to use Cyrus in a setup where users don't have
# accounts on the local machine, you'll need to make sure
# you use something like pam_permit for account checking.
#
# Remember that SASL (and therefore Cyrus) accesses PAM 
# modules through saslauthd, and that SASL can only deal with
# plaintext passwords if PAM is used.
#

@include common-auth
@include common-account