[Dovecot] lmtp bouncing -- Invalid parameters (in reply to MAIL FROM command)

[Jan-Frode Myklebust]

I just configured postfix' virtual_transport to point at my dovecot
director, but am seeing occational problems like this:

	Aug 31 11:50:06 smtpgw postfix/lmtp[5339]: 69E2F5410D: to=<email at example.net>, relay=loadbalancers.example.net[192.168.42.17]:24, delay=0.15, delays=0.14/0.01/0/0, dsn=5.5.4, status=bounced (host loadbalancers.example.net[192.168.42.17] said: 501 5.5.4 Invalid parameters (in reply to MAIL FROM command))

but can't find anything interesting in the dovecot logs.. Anybody have 
ideas for how to make postfix play nice with dovecot's lmtp ?

	smtpgws% rpm -q postfix
	postfix-2.3.3-2.1.el5_2

	loadbalancers% rpm -q dovecot
	dovecot-2.0.13-2

	backendmailstorers% rpm -q dovecot
	dovecot-2.0.13-2


  -jf