Find below a list of messages that can appear in the security log of Kerio Connect 8.0 and what they mean: SMTP Spam attack detected from 85.51.174.157, client closed connection before SMTP greeting This message only appears if Spam Repellent is switched on. It means that the client (sending mail server) hasn't waited the 25 seconds (or whatever is configured in Spam Repellent) for the SMTP greeting. It closed the connection too early. This is indicative of bot net Spam as normal mail servers would Read more [...]