Postfix can't connect to lmtp

[wim at unetix.nl]

I got the most simple postfix-cyrus up , but when I try
to send mail with the user account I get the following
error from postfix:

Oct 16 17:28:52 aardappel postfix/lmtp[4485]: F36F1D96A3: 
to=<piet at aardappel.unetix.nl>, relay=none, delay=1, status=deferred (connect 
to /var/imap/socket/lmtp[/var/imap/socket/lmtp]: Permission denied)

Why is permission denied? What process determines whether 
connection is allowed or not?

TIA
Wim Bakker


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