qmail + vpopmail: queue problem (some messages "stucks")

Have got FreeBSD 6.2, qmail, vpopmail.
All mail is taken by pop3retriver from our ISP to default mailbox, and then sorted to user's mailboxes.

But now I have got trouble with queue - sometimes it "stucks".
But not completely.
New messages arrives and delivers to mailboxes, everything is okay.
But oldies are not (and that pile grows ;) ).

First off, I thought there's a problem with "vdelvermail" agent; but in that case all mail would stuck, and in my case some mail won't.

Please throw me some cues - where to go? :)
 
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