About WarmupInbox

WarmupInbox is an email deliverability tool that automatically warms up inboxes by simulating natural, human-like email activity — sending, opening, replying, and marking emails as important across a network of real inboxes. This builds up sender reputation over time, helping cold outreach and marketing emails land in the primary inbox instead of spam or promotions folders. It works with major providers (Gmail, Outlook, and custom SMTP/IMAP setups) and provides a deliverability score along with spam-test results so users can track inbox health before launching outreach campaigns. It's built for sales teams, agencies, and marketers running cold email or high-volume outreach who need their sending domain to stay trusted rather than flagged.