Hi Michael
EmailWithAttachments uses JavaMail as the api, which in turn uses InternetAddress class to parse the address string into an array of addresses.
http://java.sun.com/products/javamail/javadocs/index.htmlThis accepts a comma separated list.
(Outlook uses semi-colons.)
I'm also 90% sure that I've used a comma separated list myself, although I haven't verified this.
Are you sure that it's not some other problem - eg the second email address is incorrectly spelled, you're using a space after the comma, email addresses outside your domain are being restricted by the SMTP server, the inbound email is being marked as junk mail, etc.
Good luck,
Howard
http://www.avoka.com