It provides bulk SMTP mailboxes, custom domain management, and tools to prepare accounts for sending, with plans designed for individuals, companies, agencies, and consultants. Users can purchase domains through winnr or connect domains they already own; the platform automates DKIM, SPF, and DMARC configuration and supports bulk creation and management of email users. Its universal mailbox lets customers read and send messages across accounts in one place, while CSV exports support major sales platforms, including Smartlead, Instantly, Snov, and SalesHandy.

For teams building automated workflows, winnr offers a REST API for managing domains, users, and inboxes. Built-in email warming is available to help develop sender reputation, with automated volume ramp-up and performance analytics. Plans include account and domain allowances, sending limits, and support options; enterprise customers can add dedicated IPs. The company advertises a 90% deliverability guarantee and a refund policy for the most recent month, subject to its stated terms.