File smstools3-README.SLE of Package smstools3

smstools for SUSE Linux Enterprise Products
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smsd on SUSE Linux Enterprise runs with limited user privileges by default.

Please be aware that this might cause trouble either if you use other
devices than /dev/ttySX for your GSM Modems (e.g. USB Modems) or if you
changed permissions on one or some files that smsd uses. These are: The
device nodes which it is configured for, its spool directories
under /var/spool/sms, its runtime files under /var/run/smsd/ and its
logfiles / stats under /var/log/smsd/. 

The default user for smsd is 'smsd' / group 'uucp'.

To allow an user to send SMS, the user needs to be in the group 'sendsms'.