|Forced unlock denied on "x"
||No write permission in the directory where lockfile "x" resides, or
more than one lockfile trying to
force a lock at exactly the same
|Forcing lock on "x"
||Lockfile "x" is going to be removed by force because of
a timeout (compare LOCKTIMEOUT in procmail(1)).
|Out of memory, ...|| The system is out of swap space.|
|Signal received, ...|| Lockfile will remove anything it
created till now and terminate.|
|Sorry, ...|| The retries limit has been reached.|
|Truncating "x" and retrying lock
||"x" does not seem to be a valid
|Try praying, ...|| Missing subdirectories or insufficient privileges.|