/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # 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
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