Do we need a dedicated IP address?

If your account has a limit of at least 100,000 emails per month, we automatically assign a dedicated IP address to you. Below this email volume, a shared IP address is actually better for email delivery, as you may not be sending a consistent enough volume of emails for recipient ESPs (like Gmail) to judge your reputation. If you send more than 500,000 emails per month we recommend getting a pool of dedicated IP addresses, as some ESPs restrict the number of emails they receive from each IP address.