[xwiki-users] XWiki 6.1 - Share page by email - error

Hi, We have an xwiki 6.1 installation and we can't figure out the « Share page by email » function. It works very well for Admin users, but it doesn't work for regular users. We get an error message saying "Error: The message could not be sent to userX : email server error." (Or in French : Le message n'a pas pu être envoyé à UserX : Erreur du serveur email.) It's the same error message seen for this problem (look at the error.png attachment) : http://jira.xwiki.org/browse/XE-1451 It looks like a permission problem, but I don't where to look. The stack trace on the other hand says that there is an illegal semicolon somewhere in the address field, which prevents the MailSenderPlugin from sending the email. Again, only for regular users, Admins are OK. I've intercepted the http requests with Fiddler, even look at the POST payload and I don't see any semicolon. View the stack trace here: https://gist.github.com/anonymous/acafd8dfd501596ff94c2277982867d4 Can someone provide some insight? Best regards, Henri-Robert Sully