Original*** Grkunderway

Suddenly I cannot send group messages on Live Mail.  I can send individual messages, but when I try to send group messages I get a "This message could not be sent, type an email address for one or more recipients in the to, cc or bcc box"   I have talked with my service provider and the numbers I use in my groups is not the issue.  I send to several groups ranging from 6 ot 30 addressees.