Mission Inbox

Mission Inbox is a dedicated email infrastructure platform with two sides: outbound infrastructure for sales teams and agencies, and developer infrastructure for product and transactional email.

Sending is separated into isolated environments it calls Cubes, so sales, marketing and transactional mail do not affect each other's reputation, and dedicated IPs are included rather than shared pools. MI Shield runs pre-send checks on content, headers, DNS and spam signals to catch problems before emails go out, and infrastructure fails over across three continents. Outbound customers send through the tools they already use, including HubSpot, Salesforce, Apollo, Outreach and Smartlead, while developers connect through a REST API with SDKs, SMTP and webhooks.

Mission Inbox says it handles more than 50 million emails a month and reports a 98% inbox rate.

The Outbound Lite plan costs $50 a month for 15 mailboxes and 5,000 sends, and Outbound Scale is $199 a month for 30 mailboxes and 10,000 sends. The Developer Pro plan is $99 a month. You can explore with a free demo account without a credit card.