Entourage won't send a message to a large group

Is there a limit on the number of addresses in a group? Or does it depend on the ISP? Or does it matter if you're sending an HTML? I keep trying to send an HTML message to 102 recepients and have gotten two types of error messages: 1) Addressee not recognized; 2) Too many addresses. I got the second message after purging the unknown names. I regullarly send pdf-attached emails to a list of 73 names. What gives?
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allenwatsonCommented:
ISPs limit the number of recipients for any message. You should try breaking the recipient list into two parts of equal number. The most frequent limit is 50 names. There is an AppleScript on macscripter.net that will automatically break up a group into messages with "n" recipients. It's called "Separate Group Messages".

http://files.macscripter.net/scriptbuilders/Outlook-Express/Separate-Group-Messages.sit
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