/usr/share/perl5/Mail/MtPolicyd/Plugin/ is in mtpolicyd 2.02-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Mail/MtPolicyd/Plugin/Accounting.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Action.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/AddScoreHeader.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/ClearFields.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Condition.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/CtIpRep.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/DBL.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Eval.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Fail2Ban.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/GeoIPAction.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/GeoIPLookup.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Greylist.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Honeypot.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/LdapUserConfig.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/PostfixMap.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Proxy.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Quota.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/RBL.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/RBLAction.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Result.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/ConfigurableFields.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/PluginChain.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/Scoring.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/SqlUtils.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Role/UserConfig.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SMTPVerify.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SPF.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SaAwlAction.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SaAwlLookup.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/ScoreAction.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SetField.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SqlList.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/SqlUserConfig.pm
/usr/share/perl5/Mail/MtPolicyd/Plugin/Stress.pm