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In your Customer.io dashboard go to the Workspace Settings section. In this section on the Email row click the Settings button.
Go to Custom SMTP Settings and click the Add Custom SMTP Server button.
In the Add Custom SMTP Server section add the following details:
Address: mail.smtp2go.com
Port: 2525
Authentication: Plain
Username and Password: this can be found in your SMTP2GO dashboard under “Settings > Users”.
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