How do I reformat strings in the "s" format to readable formats?

Pipe your log files through tai64nlocal. This will edit the time stamp and make it into something that is more readable.

tail -f /var/log/qmail/current| tai64nlocal

You may also use something like qmailanalog. 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.