Warmup Inbox

Warmup Inbox builds a mailbox's sender reputation with real traffic across a 30,000+ inbox network, then reports placement and reputation, priced per inbox.

Warmup Inbox is an email deliverability service that builds and protects a mailbox's sender reputation before it goes into cold outreach. It exchanges real, human-like email traffic across a network of more than 30,000 inboxes, then reports back on inbox placement, spam-folder rate and authentication status for each mailbox it warms. It is a product of itrinity, the Bratislava, Slovakia SaaS group that also owns Mangools and EmailListVerify, and its operating legal entity is CyberPanda s. r. o. of Bratislava. Automated mailbox warm-up is the core, with AI-generated warm-up content, custom warm-up templates and a choice of topic and language, and the daily message volume and reply rate rise by tier. Around it sits a deliverability toolkit: inbox placement testing that shows whether a message lands in the inbox, promotions or spam, blocklist monitoring across more than 100 lists, IP and domain reputation monitoring, an SPF, DKIM and DMARC authentication checker, and a content and spam-trigger link scanner that flags problems before a send. A deliverability testing API opens the same checks to developers, and connectors cover Gmail, Google Workspace, Outlook, Microsoft 365, Amazon SES, SendGrid, Brevo, Mailgun, Zoho Mail and custom SMTP. Multi-client workspaces, white-label reports and consolidated billing arrive on the Custom plan. Warmup Inbox suits agencies warming inboxes for multiple clients, sales teams running cold email outreach, recruiters and lead-generation teams sending high volume, new senders building a domain's and IP's reputation, and teams already sending through Gmail, Outlook, Amazon SES or SendGrid. It is priced per inbox rather than per account, so every mailbox added to the network is its own subscription, on the Basic, Pro and Max tiers billed monthly or yearly, with a Custom plan for larger inbox counts, and the trial needs no card. In daily use Warmup Inbox warms a new sending domain before a cold outreach campaign, tests inbox placement across the major mailbox providers before a large send, watches sender reputation and blocklist status over time, verifies the SPF, DKIM and DMARC records and rescues a domain that has started landing in spam. It sits beside the mailbox provider and the outreach or email platform that does the sending rather than replacing either.