After upgrade to MS 4.74 mails are stuck in queue.

[Kai Schaetzl]

might be helpful to know from which version you upgraded and how you make 
postfix and mailscanner work together. (I remember there where at least 
two methods in the past.) You had these already running for a while with 
your last MS setup?
postfix 2.5.5
ClamAV 0.94.2
Spamassassin 3.2.5

Kai

-- 
Kai Schätzl, Berlin, Germany
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