We've (CM_Tsang and I) have been working on isolating this problem for a while now. We finally did determine what is causing this problem.<br><br>Basically, the "Maximum samples to hold in memory" was set too low. The setup in this case had e-mails going out at maximum every 30 minutes. The "Max samples in memory" was actually set to only hold about 25 minutes worth of data at a time, so sometimes the alert would go out based on conditions that had already dropped out of memory.<br><br>To fix this problem, just change the "Max samples to hold in memory" to hold at least the amount of time your maximum e-mail frequency is, preferably a bit more (as the history files that can be included in the e-mails can actually show more data than this).<br><br>This post was really for the benefit of anyone else having this problem.<br><br>