You have the ability to Set Up Organization-Wide Email Addresses and enter individual email addresses to be used when you send email using Salesforce. If you need to add a large number of email addresses, you can also mass create them using Data Loader.
To mass upload organization-wide email addresses, follow the below steps:
Step 1: Create a CSV with following column headers:
Step 2: Once you've created the CSV file, use Data Loader to perform an Insert.
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