PostmasterMailSize

[someuser]

system is CentOS 5.5
otrs 2.4.8

I read all the admin documentation
changed in Kernel/Config.pm
$Self->{'PostmasterMaxMailSize'} = '16384'; to 36384
and I still got this emails about
Email to big (18432 KB - max 16384 KB)!
I also add this line
$Self->{'PostmasterMaxMailSize'} = '16384'; to 36384
To Kernel/Config/Defaults.pm
restarted /etc/init.d/otrs restart
Nothing happends

Can somebody tell me where the fu*** I have to change or add this line
it's really pissed me off.
Thank you.

[jojo]

Never change Defaults.pm!

Search for PostmasterMaxMailSize in Sysconfig and change it there