To whom? I mean... who is the sender here? Different parties have different prices depending on who they are and where in the system they exist, the type of em

To whom? I mean... who is the sender here? Different parties have different prices depending on who they are and where in the system they exist, the type of email, the volume, and so on. A super simple answer may be: Look up the price according to Mailgun or SendGrid, and a simple answer is that it costs $1 to send ~4,000 emails.