Thread:Extension talk:Semantic Tasks/Error when sending an email

I can't send any email, I get an error in the mailer/mediawiki logs:

UserMailer::send: sending mail to "myemail@mydomain.com" <> Sending mail via internal mail function Mar 3 18:15:45 server postfix/sendmail[6730]: fatal: www-data(33): No recipient addresses found in message header Error sending mail

It seems that it takes my email as the username, and puts nothing in <>

Maybe I didn't specify correctly the 'assigned to' property ? I did the following in a page :

Assigned to::myemail@mydomain.com

Is the syntax correct ?