When add event calendar show "mailto:user@domail.com" in invitees

When I make new event and add invite in Invitees box some user have "mailto: " in front of username some one don't have. And after make event the user with "mail to:" got this mail but no event added. How to fix it.
[230 byte] By [rsuyala] at [2007-11-25 17:10:58]
# 1
You must have permission to invite each user. Check the Calendar permissions on the calendars for which the invite became a mailto: .
ciaran@moynihans.net at 2007-7-3 1:47:55 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Calendar Server...