/usr/share/perl5/ is in libcourriel-perl 0.45-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Courriel/
/usr/share/perl5/Courriel/Builder.pm
/usr/share/perl5/Courriel/Header/
/usr/share/perl5/Courriel/Header/ContentType.pm
/usr/share/perl5/Courriel/Header/Disposition.pm
/usr/share/perl5/Courriel/Header.pm
/usr/share/perl5/Courriel/HeaderAttribute.pm
/usr/share/perl5/Courriel/Headers.pm
/usr/share/perl5/Courriel/Helpers.pm
/usr/share/perl5/Courriel/Part/
/usr/share/perl5/Courriel/Part/Multipart.pm
/usr/share/perl5/Courriel/Part/Single.pm
/usr/share/perl5/Courriel/Role/
/usr/share/perl5/Courriel/Role/HeaderWithAttributes.pm
/usr/share/perl5/Courriel/Role/Part.pm
/usr/share/perl5/Courriel/Role/Streams.pm
/usr/share/perl5/Courriel/Types/
/usr/share/perl5/Courriel/Types/Internal.pm
/usr/share/perl5/Courriel/Types.pm
/usr/share/perl5/Courriel.pm
/usr/share/perl5/Email/
/usr/share/perl5/Email/Abstract/
/usr/share/perl5/Email/Abstract/Courriel.pm