Here is a quicker way to install greylisting and give it a decent control panel in plesk
[sourcecode]wget -q -O – http://www.atomicorp.com/installers/atomic | sh
yum install spamdyke
yum install psa-spamdyke
yum install spamdyke-utils[/sourcecode]
Big thanks to http://www.atomicorp.com/
I don’t trust or use the builtin greylisting in plesk as it is borked and I can’t see them getting it right.