MailScanner won't run ...

[Michael Grimm]

Hi --

I'm absolutely new regarding MailScanner, and I would like to migrate from amavisd-new, but:

This is my test mail server running in a FreeBSD jail:
	FreeBSD 9.1-RELEASE
	postfix 2.9.5
	clamav 0.97.6
	spamassassin 3.3.2
	perl 5.14.2

Following http://www.mailscanner.info/postfix.html I did modify MailScanner.conf as follows:
	Run As User = postfix
	Run As Group = postfix
	Incoming Queue Dir = /var/spool/postfix/hold
	Outgoing Queue Dir = /var/spool/postfix/incoming
	MTA = postfix

plus (due to clamav):
	Incoming Work User = 
	Incoming Work Group = clamav
	Incoming Work Permissions = 0640

and:
	SpamAssassin User State Dir = /var/spool/MailScanner/spamassassin

I did create the following directories:
	drwxrwxr-x    5 postfix          postfix	var/spool/MailScanner
	drwxr-xr-x    2 postfix          postfix	/var/spool/MailScanner/spamassassin
	drwxr-xr-x    2 postfix          postfix 	/var/spool/MailScanner/quarantine
	drwxr-xr-x    4 postfix          clamav		/var/spool/MailScanner/incoming
	drwx------    2 postfix          postfix	/var/spool/MailScanner/incoming/SpamAssassin-Temp
	drwxr-x---    2 postfix          postfix	/var/spool/MailScanner/incoming/Locks

"MailScanner --lint" and "spamassassin --lint" do run to completion without any complaints.

*BUT*: Whenever I do inject mail messages, they will be put into postfix' hold queue (as intended by postfix' header_checks) for ever, but MailScanner won't do *anything*, no single syslog entry, nothing, absolutely nothing :-( I would have expected that there were some complaints in syslog, but there's nothing! And, I did try a lot of different variations of what should be configured (according help text in MailScanner.conf and google searching).

MailScanner --debug isn't helpful, either. Nothing happens, nothing.
MailScanner -h tells me that I do have all modules installed.

I never ever experienced something comparable before: no error messages in syslog or wherever that would tell me about my mistakes :-( 

Thus: Anybody here that could teach me what to test next?

Thanks and with kind regards,
Michael