I am working on a test Xeams server to filter our mail. I have it all working well but wondered whether anybody could expand on configuring the grey listing. I have read the FAQ and adjusted the greylising thresholds in server.properties. I wondered how long a 'good' IP is effectively whitelisted for? So once a message has passed greylisting, for how long will subsequent email from the same IP be whitelisted/accepted and is this adjustable?