_Description: Should the dotlock helper be installed ‘setgid mail’?
S-nail protects mbox files via fcntl(2) file-region locks during
file operations in order to avoid inconsistencies due to concurrent
modifications. By default system mbox files are also locked using
traditional dotlock files.
On Debian system users normally lack the permissions to create files in
the directory containing the system mailboxes (/var/mail/). In this case
a dedicated privileged (setgid mail) dotlock helper is needed, however
this may be a security concern.