Postman allows you to control how much personalisation should be sprinkled in each message. Message templates can be used in a few ways:
Generic message for everyone
Mostly standardised content with a few keywords like
Unique message for everyone.
Most of our users have an internal database that includes all of their contacts. You can export the contact list in a CSV file.
If you are not sure what to include in your csv file, you can
Download a sample .csv file in the step for uploading the recipient list in CSV format.
You can test the message by sending it to your self and then go ahead and send your campaign.
Select your data > go to Data > Remove Duplicates > select all columns > click OK
For comprehensive instruction on duplicate removal, please go to Microsoft Excel Support Page.