Subscribe to newsletters at scale — automatically. Warm your inbox, research competitors, train your filters. On autopilot.
Free forever · No credit card required
Real newsletters signal to providers your inbox is active — improving deliverability before campaigns.
Subscribe to competitor newsletters simultaneously. Track strategies, funnels, and copy in one inbox.
Train Gmail and Outlook filters faster with real categorized email volume instead of synthetic mocks.
Authentic email traffic for testing parsers, spam detection, and automation pipelines. No fixtures.
Provide the email address you want newsletters delivered to. Gmail, Outlook, or custom domain — all work identically.
Choose from 8 curated niches (Pro) and set how many newsletters you want. Discovery or High-quality mode.
InboxFlood subscribes automatically. Newsletters arrive within hours. Need to undo it? Unsubscribe from everything in one click from your dashboard.
Enter your email, pick a niche, set volume — InboxFlood handles everything.
My cold email open rates jumped noticeably after two weeks of inbox warming. Setup took under a minute.
I monitor 40+ competitor newsletters at once now. Would have taken me hours to subscribe manually.
Our QA team needed realistic inbox data for testing. InboxFlood generates it in seconds instead of days.