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If you want to send 600 emails or more, you need to use a service like mailchimp.com or mailjet.com do not use your Yahoo personal email address or company email account to send emails because your IP or domain name will be blacklisted.
Let me know if you need more help
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You only pay $10 per month, you can see the pricing here
To get started with MailChimp please go to the following page : https://kb.mailchimp.com/getting-started/getting-started-with-mailchimp