/var/spool/smsclient/errors/ is in smsclient 2.0.8z-10.
This file is owned by root:root, with mode 0o755.
..
/var/spool/smsclient/errors/ampi/
/var/spool/smsclient/errors/answer/
/var/spool/smsclient/errors/azcom/
/var/spool/smsclient/errors/broken/
/var/spool/smsclient/errors/bteasyreach/
/var/spool/smsclient/errors/btmessagemaster/
/var/spool/smsclient/errors/callmax/
/var/spool/smsclient/errors/cellnet/
/var/spool/smsclient/errors/d1/
/var/spool/smsclient/errors/d2/
/var/spool/smsclient/errors/detemobil/
/var/spool/smsclient/errors/digifone/
/var/spool/smsclient/errors/eirpage/
/var/spool/smsclient/errors/eplus/
/var/spool/smsclient/errors/europolitan/
/var/spool/smsclient/errors/generic/
/var/spool/smsclient/errors/hello/
/var/spool/smsclient/errors/kpn/
/var/spool/smsclient/errors/libertel/
/var/spool/smsclient/errors/minicall/
/var/spool/smsclient/errors/minicall_new/
/var/spool/smsclient/errors/mobistar/
/var/spool/smsclient/errors/mtn/
/var/spool/smsclient/errors/netcom/
/var/spool/smsclient/errors/nz/
/var/spool/smsclient/errors/one2one/
/var/spool/smsclient/errors/orange/
/var/spool/smsclient/errors/pageone/
/var/spool/smsclient/errors/proximus/
/var/spool/smsclient/errors/skytel1/
/var/spool/smsclient/errors/skytel2/
/var/spool/smsclient/errors/snpp/
/var/spool/smsclient/errors/swisscom/
/var/spool/smsclient/errors/telenor/
/var/spool/smsclient/errors/telia/
/var/spool/smsclient/errors/telstra/
/var/spool/smsclient/errors/tim/
/var/spool/smsclient/errors/ucp_tcp/
/var/spool/smsclient/errors/vodacom/
/var/spool/smsclient/errors/vodafone/
/var/spool/smsclient/errors/vodafone_autralia/
/var/spool/smsclient/errors/vodafone_tap/
/var/spool/smsclient/errors/vodapage_block/
/var/spool/smsclient/errors/vstream/