Most ISPs limit the number. You could establish Distribution Lists that each
contain up to the limit set by your ISP. You can also use the mail merge and
send individual messages. I have a commercial account and can send 300 at at
time. With my Bulk Mail permit, I am allowed to send up to 1,000 after 11:00
p.m.
The next problem what will rear its ugly head, you may be blocked by AOL or
Yahoo if your volume reaches a number within a 24 hour period that they have
established and won't tell you what it is. I haven't been able to send to
AOL or Yahoo for almost two years. Out computer club has used an Access
database with C++ code to automatically, send messages in groups of 50 to
our 1,000 + members. Many clubs in our age restricted (55+) community of
14,000 have similar problems.