Trying to send an email to multiple people?

I need to send details of an event to about 25 random email addresses.Don't want to create a Category as it is a one time thing. When I try to send Yahoo tells me something doesn't look right about a recipient. I've checked punctuation,spelling,spacing,etc but can find nothing amiss.

Trying to send an email to multiple people?
Just make sure the addresses are in the format username@whatever.com (or .net)... Other than that, make sure there is a comma (,) or semicolon (;) between addresses.
Reply:may be you got the email wrong, check the email addresses of the recipient.
Reply:You need to put this ; between all email addresses