Apple Mail already allows to send an email to a group, i.e., multiple people. If you do so, everyone will receive the same email, of course.
With Serial Mail you can create an email template containing certain placeholders (e.g., for the name of the recipient) which are then replaced by the corresponding value from the recipients address book before sending the email.
Serial Mail does not replace Apple Mail. It does not send the emails. Instead each generated email is showed for review and, if accepted, placed in your Apple Mail's
- Link to style sheet library (in development), e.g. with a style sheet for Christmas greetings.