/usr/share/sendmail/cf/feature/ is in sendmail-cf 8.15.2-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/sendmail/cf/feature/accept_unqualified_senders.m4
/usr/share/sendmail/cf/feature/accept_unresolvable_domains.m4
/usr/share/sendmail/cf/feature/access_db.m4
/usr/share/sendmail/cf/feature/allmasquerade.m4
/usr/share/sendmail/cf/feature/always_add_domain.m4
/usr/share/sendmail/cf/feature/authinfo.m4
/usr/share/sendmail/cf/feature/badmx.m4
/usr/share/sendmail/cf/feature/bcc.m4
/usr/share/sendmail/cf/feature/bestmx_is_local.m4
/usr/share/sendmail/cf/feature/bitdomain.m4
/usr/share/sendmail/cf/feature/blacklist_recipients.m4
/usr/share/sendmail/cf/feature/block_bad_helo.m4
/usr/share/sendmail/cf/feature/compat_check.m4
/usr/share/sendmail/cf/feature/conncontrol.m4
/usr/share/sendmail/cf/feature/delay_checks.m4
/usr/share/sendmail/cf/feature/dnsbl.m4
/usr/share/sendmail/cf/feature/domainmap.m4
/usr/share/sendmail/cf/feature/domaintable.m4
/usr/share/sendmail/cf/feature/drac.m4
/usr/share/sendmail/cf/feature/enhdnsbl.m4
/usr/share/sendmail/cf/feature/generics_entire_domain.m4
/usr/share/sendmail/cf/feature/genericstable.m4
/usr/share/sendmail/cf/feature/greet_pause.m4
/usr/share/sendmail/cf/feature/ldap_routing.m4
/usr/share/sendmail/cf/feature/limited_masquerade.m4
/usr/share/sendmail/cf/feature/local_lmtp.m4
/usr/share/sendmail/cf/feature/local_no_masquerade.m4
/usr/share/sendmail/cf/feature/local_procmail.m4
/usr/share/sendmail/cf/feature/lookupdotdomain.m4
/usr/share/sendmail/cf/feature/loose_relay_check.m4
/usr/share/sendmail/cf/feature/mailertable.m4
/usr/share/sendmail/cf/feature/masquerade_entire_domain.m4
/usr/share/sendmail/cf/feature/masquerade_envelope.m4
/usr/share/sendmail/cf/feature/msp.m4
/usr/share/sendmail/cf/feature/mtamark.m4
/usr/share/sendmail/cf/feature/no_default_msa.m4
/usr/share/sendmail/cf/feature/nocanonify.m4
/usr/share/sendmail/cf/feature/nopercenthack.m4
/usr/share/sendmail/cf/feature/notsticky.m4
/usr/share/sendmail/cf/feature/nouucp.m4
/usr/share/sendmail/cf/feature/nullclient.m4
/usr/share/sendmail/cf/feature/prefixmod.m4
/usr/share/sendmail/cf/feature/preserve_local_plus_detail.m4
/usr/share/sendmail/cf/feature/preserve_luser_host.m4
/usr/share/sendmail/cf/feature/promiscuous_relay.m4
/usr/share/sendmail/cf/feature/queuegroup.m4
/usr/share/sendmail/cf/feature/ratecontrol.m4
/usr/share/sendmail/cf/feature/redirect.m4
/usr/share/sendmail/cf/feature/relay_based_on_MX.m4
/usr/share/sendmail/cf/feature/relay_entire_domain.m4
/usr/share/sendmail/cf/feature/relay_hosts_only.m4
/usr/share/sendmail/cf/feature/relay_local_from.m4
/usr/share/sendmail/cf/feature/relay_mail_from.m4
/usr/share/sendmail/cf/feature/require_rdns.m4
/usr/share/sendmail/cf/feature/rhsbl.m4
/usr/share/sendmail/cf/feature/smrsh.m4
/usr/share/sendmail/cf/feature/stickyhost.m4
/usr/share/sendmail/cf/feature/tls_session_features.m4
/usr/share/sendmail/cf/feature/use_client_ptr.m4
/usr/share/sendmail/cf/feature/use_ct_file.m4
/usr/share/sendmail/cf/feature/use_cw_file.m4
/usr/share/sendmail/cf/feature/uucpdomain.m4
/usr/share/sendmail/cf/feature/virtuser_entire_domain.m4
/usr/share/sendmail/cf/feature/virtusertable.m4
/usr/share/sendmail/cf/feature/vnet.m4