qmailanalog is a collection of tools to help you analyze qmail's activity
record. It supplies statistics to answer a wide variety of questions:

  overall: how many messages? recipients? attempts? etc.
  ddist: how soon were 50% of the messages delivered? 90%? 95%? 99%?
  rxdelay: what's the best order of recipients for mailing lists?
  recipients, rhosts: who's getting mail? bytes? messages? attempts?
  successes, failures, deferrals: why? how often? how much delay?
  senders, suids: messages? bytes? load? recipients? attempts? delay?

qmailanalog also includes several tools to focus attention on particular
senders, recipients, or messages.