How do I fix Entourage error 17099 ?  Error msg also states: "  <>:
missing or malformed local part "
I run Mac OS X 10.3.9, and Entourage / Office for Mac 2004.
Entourage shows this error msg when it fails to send a Mail Group em.
I have inspected the addresses in the group and they all appear
structurally OK. Mail group ran fine for months, but recently I added
four more addresses. To isolate the problem addresses I have split the
mail group in half and tested each half and then split the failed half
in half again (etc) and I have isolated four em addresses on that
group as causing the error. These are the four most-recently added
addresses. But wait: The four addresses are good ones: ems sent to
them individually or with a multi-recipient em run fine. Only in a
mail group does the problem show.