Locking problem??

Hi,

I have had problems with procmail not being able to unlock some files
and thus loosing mail.

I'm using procmail v3.11pre7 1997/04/28 version in Solaris 2.5.1 environment
with Solaris mailtool.

Here is a sample from my log file, where I can see the subject of the mail
I never got:

        From Aune(_dot_)Kontio(_at_)lmf(_dot_)ericsson(_dot_)se  Thu Jan 29 
09:45:53 1998
         Subject: Koodit halytysjarjestelmaa varten
          Folder: /home/antti/Mail/mbox                             7482
        procmail: Couldn't unlock "/home/antti/.lockmail"
        procmail: Couldn't unlock "/home/antti/Mail/mbox.lock"

Here is my .forward:
        "|IFS=' ' && p=/home/antti/bin/procmail && test -f $p && exec $p -Yf- 
|| exit 75 #antti"
        

and here is my .procmailrc:
        
        # Please check if all the paths in PATH are reachable, remove the ones 
that
        # are not.
                
        PATH=$HOME/bin:/usr/bin:/usr/ucb:/bin:/usr/local/bin:.
        MAILDIR=$HOME/Mail      # You'd better make sure it exists
        DEFAULT=$MAILDIR/mbox
        LOGFILE=$MAILDIR/from
        LOCKFILE=$HOME/.lockmail
        
        :0                              
        * ^Subject:.*Turbobricks
        Turbobricks
        
        :0
        * ^X-Assistance:.*For subscription assistance, please see 
http://www.SwedishBricks.net/lists/
        Swedishbricks
                
        :0
        * ^From.*UnixHelp-request
        Unixhelp
        
        # Anything that has not been delivered by now will go to $DEFAULT
        # using LOCKFILE=$DEFAULT$LOCKEXT



So can anyone give me a hint, why this happens and what should I do?
I'm not on the procmail mailing list, so please answer directly to me
to Antti(_dot_)Kiiski(_at_)lmf(_dot_)ericsson(_dot_)se

Thanks,

--
Antti Kiiski