Share by email feature doesn't use the user's logged in email address in the sent email from address

If I use "send by email" action I get an error in the UI.

• UI errors on send to admin user are "The message could not be sent to admin: unknown email address" and "The message could not be sent to Administrator: email server error."
• This script works http://extensions.xwiki.org/xwiki/bin/view/Extension/Test+Mail
• I tried with admin and normal user, same error
• I checked, both users have valid email address
• I enabled email debug and get this line

-------- xwiki error ----------------------
2011-07-12 15:13:42,765 http://xwiki.intertesto.com/xwiki/bin/get/Blog/?xpage=shareinline ERROR c.x.x.p.m.MailSenderPlugin - Detaile
d email informationFrom [utente utente <noreply@127.0.0.1>], To [gianluca.sabena@intertesto.com], Subject [utente utente wants to share a
document with you], Text [.....]
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• I guess the script doesn't get the correct email from logged in user account in order to use it in "email from" field
• This error will trigger a second error in smtp server (I use postfix)

-------- postfix error ----------------------
Jul 12 14:59:56 asd-2 postfix/smtpd[7015]: warning: Illegal address syntax from localhost.localdomain[127.0.0.1] in MAIL command: <noreply@127.0.0.1>
---------------------- ----------------------

• The postfix error end in another error in Xwiki

-------- xwiki error ----------------------
2011-07-12 15:13:42,775 http://xwiki.intertesto.com/xwiki/bin/get/Blog/?xpage=shareinline ERROR c.x.x.p.m.MailSenderPlugin - sendEma
ilFromTemplate: XWiki.SharePage vcontext: org.apache.velocity.VelocityContext@99e5c3 com.sun.mail.smtp.SMTPSendFailedException: 501 5.1.7 Bad sender address syntax
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