[imp] The sender is shown as the "to" field

[Esserino No13]

With my Horde 2.2.3&Imp 3.2.1 installation i get this very strange fact: if
i send an email to a local user who resides on the smtp server used by IMP
to send mail, in the message list the "from" field is 'To:
<receiving_user>'. But if i click on it to view the body of the message, the
"From" fiels is correct; and if the message is received from outside
everything is ok!

Thanks!