On 1.9.2011, at 17.41, Luigi Rosa wrote:

> Sep  1 16:39:43 mail dovecot: stats: Error: Mail server input error:
> UPDATE-SESSION: stats shrank

Oh.. What OS is this? See what it logs with 
http://hg.dovecot.org/dovecot-2.1/rev/1c2d8da38a06

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