INBOX applies all the required sender authentication protocols (dkim, sender id, spf, domainkey). Additionally, it uses the globally known e-mail delivery engines. With its e-mail sending capacity that may go up to 20 million per hour, Inbox can offer dedicated speed up to 5 million for its customers, as well.
Moreover, INBOX can assign dedicated IP addresses to its customers, make the required Hotmail SDNS Network and Yahoo Feedback Loop settings and similar settings for Gmail. Thus, Inbox can create a virtual delivery area special to the customer.
Considered all together, Inbox is one of the most powerful email providers that can apply world standards to its services with its high delivery capacity.