InboxFlood

InboxFlood is a service that automatically subscribes email addresses to hundreds of curated newsletters, solving the problem of populating inboxes with real email traffic for testing, competitive research, and filter training. It targets marketers, developers, and QA teams in companies of all sizes, from startups to enterprises. The service is positioned as an automated alternative to manual newsletter subscriptions, offering bulk subscriptions, category selection, and delivery modes (inbox, spam, mixed) with a free tier and paid plans.

Key features

• Bulk-subscribe any email address
• 15 curated categories (Pro+)
• Delivery targeting (inbox, spam, mixed)
• High-quality mode (Pro+)
• Monthly auto-refresh (Business+)
• One-click undo unsubscribe
• Dashboard & history
• Priority queue (Enterprise)