Creation of many email addresses, and ongoing monitoring

For Yahoo, Hotmail, and Gmail, we need around 200 email accounts to be created (600 in total). A list of usernames, and passwords for each provider will be provided. We will start sending emails to those 600 email addresses. You will need to monitor all email addresses. Any emails received from the sender address/domain that we let you know we are sending from will need to be marked as NOT spam (if they get flagged as spam), and opened once they are in the inbox. This piece of work will go on for up to two weeks. The monitoring piece may re-occur and we would like to use the same contractor in the future for this work (a separate chargeable project)