You can use to create multiple letters with the same body or message but are addressed to different people.

You can use Mail merge  to create multiple letters with the same body or message

Explanation:

Mail merge is the option which can be used by the user to create multiple letters with the same body. Mail merge consists of letters and pre-addressed envelope. It has the ability to connect with a data source to obtain the information pertaining to the recipient namely, name of recipient, address and other related information.

Mail merge can also be used to create multiple documents at once. It is possible to create batch of letters which enables the organization to proceed faster.  

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