I have a bug report from a client who upgraded to Mavericks.
He's running a script pulls a few e-mail addresses and uses Send Mail[ Client ] to create e-mails using the Mail.app. Apparently Mavericks handles multiple e-mail addresses differently and the delimiter he was using (a comma, I think. He's also tried a simple space) no longer works.
I'm still on 10.7 so I can't test it.
Anyone know what the correct delimiter is?