On sending my first e-mail to my buddy list of 50 plus people I always receive the following error message. One or more of my buddies does not have a e-mail address. When this first happened I checked my buddy list & all had proper addresses. I left windows live mail & then right back in & sent the same e-mail that went thru. This never happens when I send an individual e-mail.  Can anyone explain what is happening & how can I correct it.

[Original title: sending e-mail]