/usr/lib/x86_64-linux-gnu/dspam/libpgsql_drv.so is in libdspam7-drv-pgsql 3.10.1+dfsg-11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/dspam/libpgsql_drv.so.7.0.0
/usr/lib/x86_64-linux-gnu/dspam/libpgsql_drv.so.7.0.0