Not killing off previous parent process

[Craig White]

Ubuntu 10.04 LTS
MailScanner-4.84.1-1 (from tarball) happened with 'stable' versions
where I had to use -U option too.

starts fine...

# ps aux|grep MailScanner
postfix  25689  0.0  0.6  26652 20412 ?        SNs  17:54   0:00
MailScanner: master waiting for children, sleeping
postfix  25690  0.2  1.6  66984 52136 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  25695  0.2  1.6  66964 52092 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  25697  0.2  1.6  66548 51692 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  25700  0.2  1.6  66548 51840 ?        SN   17:54   0:02
MailScanner: waiting for messages
root     26072  0.0  0.0   3324   800 pts/0    S+   18:14   0:00 grep
--color=auto MailScanner

# cat /var/run/MailScanner/MailScanner.pid 
25689

then later...

# ps aux|grep MailScanner
postfix  25689  0.0  0.6  26652 20412 ?        SNs  17:54   0:00
MailScanner: master waiting for children, sleeping
postfix  25690  0.1  1.6  66984 52140 ?        SN   17:54   0:03
MailScanner: waiting for messages
postfix  25695  0.1  1.6  66964 52096 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  25697  0.1  1.6  66548 51692 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  25700  0.1  1.6  66548 51840 ?        SN   17:54   0:02
MailScanner: waiting for messages
postfix  26161  0.0  0.6  25160 20376 ?        SNs  18:17   0:00
MailScanner: master waiting for children, sleeping
postfix  26162  0.5  1.6  64988 51632 ?        SN   18:17   0:02
MailScanner: waiting for messages
postfix  26166  0.5  1.6  65044 51628 ?        SN   18:17   0:02
MailScanner: waiting for messages
postfix  26171  0.6  1.6  64988 51632 ?        SN   18:17   0:02
MailScanner: waiting for messages
root     26299  0.0  0.0   3328   884 pts/0    S+   18:25   0:00 grep
--color=auto MailScanner

# cat /var/run/MailScanner/MailScanner.pid 
26161

So the first parent process (in this case 25689) wasn't killed and the
new parent process 26161 launched with 3 more children (I changed the
configuration is why it went from 4 to 3 children above).

How can I stop this because it only takes a day to exhaust my RAM.

Craig