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By default you send from a shared pool of IP addresses, on every plan including the free one. A dedicated IP is an optional add-on for senders with steady, high volume.

Shared pool

The shared pool is used by many senders, so you cannot be told in advance which IP address a given email will use, and there is no fixed IP range to allowlist. Your own reputation still matters most: mailbox providers judge your sending domain, which is why verifying your own domain has more effect than the IP.

Dedicated IP

To add one, open Settings → Domain, find Dedicated IPs, and click Add dedicated IPs. When the IP shows as ready, assign it to one or more sending domains. See Dedicated IPs.

Do you need one?

Usually not. A dedicated IP only helps when you send enough regular volume to keep it active. At low or irregular volume the IP goes quiet between sends and performs worse than the shared pool. It also does not fix a sending domain with a poor reputation, a list with many invalid addresses, or a mailbox provider that is refusing your email as unwanted. See Will a dedicated IP fix it? Consider one when you send hundreds of thousands of emails a month on a steady schedule and want your IP reputation separate from other senders.