MailScanner issue with postfix

[Angela Schwalm]

>
> You have sent something really weird here. Look at the sequence of
> timestamps in the log entries you just sent me...
> --
> Julian Field
> www.MailScanner.info
> MailScanner thanks transtec Computers for their support

yes, you're right...

Jun 26 17:48:48 nueslx03 postfix/qmgr[3127]: 75CE98812: from=<Angela.Schwalm at is-online.de>, size=2442, nrcpt=1 (queue active)
Jun 26 17:48:49 nueslx03 postfix/qmgr[3127]: 75CE98812: to=<angela.schwalm at nueslx03.isoftware.de>, relay=none, delay=36494, status=deferred (deferred transport)
Jun 26 20:00:01 nueslx03 update.virus.scanners: Found antivir installed
Jun 26 20:00:01 nueslx03 update.virus.scanners: Updating antivir
Jun 26 18:05:28 nueslx03 postfix/qmgr[3127]: E79AE8817: from=<Jens.Dinstuehler at is-online.de>, size=3373, nrcpt=1 (queue active)
Jun 26 18:05:28 nueslx03 postfix/qmgr[3127]: E79AE8817: to=<angela.schwalm at nueslx03.isoftware.de>, relay=none, delay=19942, status=deferred (deferred transport)

postfix does it's entries about 2 hours later. What could be the reason for this?
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