Try this:
$sql = "select emailaddress from table"
$result = odbc_exec($db, $sql);
while (odbc_fetch_row($result)) {
$email = odbc_result($result, 1);
$str .= $email .", ";
}
mail($str,'subject','msg');
I am not use to using ODBC/Access so you may need to tweak the code a bit to get it to function properly.
John
[ black dog, brown dog, you decide @ smashedbug.com ]