What is the best way to e-mail a newsletter to customers whose
e-mail addresses are located in an Access Database?
Subscribe to a service like CoolerMail and write an export from your
Access app that writes a file for uploading.
It is simply inappropriate to mass email from a desktop computer,
and it will result in your email provider getting blacklisted as a
spammer. Most importantly, your emails won't get through to a large
portion of your intended recipients.
Using Access to send email messages to individuals (or small groups
with CC and BCC of fewer than c. 10 recipients) is fine. But
attempting bulk emailing through Access is a mistake.