I have been alerted to a situation where we have frequent (although it appears inconsistent) slow delivery of emails from a Red Hat Linux SMTP relay. The emails are being delivered, but it appears to be a fairly frequent situations of slow delivery. I want to find out if the problem is on our end (etc.), and to understand the problem generally. This is a direct and simple SMTP relay used only for our IP subnets. We use Sendmail. Where and what can I look at on our Red Hat 5 system to see some evidence or information on this (possible) problem? I want to know the logs to look at, and also what to look for in the logs.