Step 2: Click on “Create new server”.
Step 3: A dialog box will pop up, asking you to choose your delivery server. If you don’t have any you can register for one just by clicking the right arrow.
Let’s say you have a Mailgun server. Select the Mailgun Web API.
Step 4: Now fill out the following details related to your server
Domain Policies: If your delivery server cannot send emails to certain domains, or it can only send to a small list of domains, you can add domain policies to reflect this. If you want to send emails only to yahoo.com but deny for any other domain, you will need a allow policy for the domain yahoo.com and a deny policy on domain * If you want to send to all domains except yahoo, then a deny policy on yahoo domain is enough. If you want a policy for all yahoo emails, including yahoo.co.uk, yahoo.com.br, etc you can simply enter “yahoo” as a policy domain. The sign * acts as a policy wildcard matching any domain. A domain of domain*.com or *domain.com has no effect.
Additional Header: If your delivery server needs extra headers in order to make the delivery, you can add them here. If a header is not in the correct format or if it is part of the restricted headers, it will not be added. Use this with caution and only if you know what you are doing, wrong headers can make your email delivery fail. Following dynamic tags will be parsed depending on context: [CAMPAIGN_UID], [SUBSCRIBER_UID], [SUBSCRIBER_EMAIL]
Step 5: Once you have filled out and saved your details. You will receive an email to activate your domain server (In the email you provided above). Your domain server will be inactive till you activate it with the link provided in your email.