How We Deliver Your Email

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 ensure that all email sent from us is authenticated and meets industry technical standards.

We have a no-tolerance policy towards spammers and diligently monitor our network for denylistings, problematic senders, and other factors that could negatively impact your deliverability.

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:

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