/usr/share/horde/ingo/lib/Script/Sieve/Test/ is in php-horde-ingo 3.2.13-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/ingo/lib/Script/Sieve/Test/Address.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Allof.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Anyof.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Body.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Exists.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/False.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Header.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Not.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Relational.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/Size.php
/usr/share/horde/ingo/lib/Script/Sieve/Test/True.php