I created a newsletter in Publisher and would now like to send it to a list
of many email addresses stored in an excel file.

How do I use a mail merge to send out this Publisher document as a
newsletter to the addresses from the excel file?

I have not been able to figure out how to do this - is the only other option
to manually enter all of the email addresses into the "To:" field when I
choose "File/Send E-Mail/Send This Page as Message"?