If you regularly sending a large number of emails and you need fast delivery and quality processing, we recommend massmailing.

In massmailing, you have your own IP address from which your emails are sent, that is, you can keep it high in reputation as compared to the shared IP of shared hosting.

At the same time, your emails are sent at the highest possible speed and so they are delivered to many recipients in a quick time.

You also have services like SPF, DKIM and configuration help for your programs where you will use mass mailing.