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Delivering your Customer.io Email Overview

There are two options for sending mail through Customer.io. You can use us to deliver the email, or you can use your existing account with a delivery provider.

Managed delivery from Customer.io

This is the default option when signing up. Customer.io uses a pool of shared IP addresses to deliver email. We use top-tier email providers to ensure that your email makes it to the inbox.

We have a no-tolerance policy towards spammers and a target rate of 0.01% of mail reported as spam for all accounts.

Use your own email account

We’re perfectly happy for you to use your own account with Customer.io. We have full support for some. If you want us to support your provider, please get in touch and let us know.

Fully Supported:

Fully supported means that Customer.io can receive feedback about what happens to the email when it leaves our servers. Things like delivered, bounced, marked as spam, opened, clicked.

Partially Supported: