How it works

Simple by design. Powerful under the hood.

InboxFlood handles every step — from finding the right newsletters to submitting your subscription across hundreds of sources simultaneously.

The process
Four steps to a flooded inbox.
Step one
Create your account

Sign up with email and password. Verify to activate. Free plan is immediate — no credit card needed.

Email registrationInstant verification linkFree plan activatedDashboard access
Step two
Configure your run

Enter the email you want newsletters delivered to. Choose niche, volume, and quality mode.

Target any email address8 curated niches (Pro)10 to 100 per monthDiscovery or High-quality
Step three
InboxFlood runs automatically

Our engine connects to a curated database of captcha-free newsletter signup pages and submits your email across all sources simultaneously.

Automated submissionsCaptcha-free databaseReal-time progressVerified completions
Step four
Newsletters arrive in your inbox

Within hours, newsletters start landing. Your history logs every run with success counts. Need to undo it? Unsubscribe from everything in one click from your dashboard.

Arrives within hoursFull job historyMonthly usage trackingOne-click undo
Quality modes
Two modes for different goals.
Free
Discovery mode

Wide variety across your chosen niche. Great for volume, bulk subscriptions, and exploring the newsletter landscape.

  • Available on all plans including Free
  • Maximum volume per run
  • Wide variety of newsletter types and styles
  • Ideal for bulk subscriptions and filter training
Pro only
High-quality mode

Established, reputable newsletters with strong engagement. Curated selection — fewer but significantly higher signal.

  • Available on Pro and Unlimited plans
  • Curated from top-performing newsletters
  • Strong sender reputation and engagement
  • Ideal for competitive research and benchmarking
Security
Built to be trustworthy.
Encrypted data

Passwords hashed with bcrypt. JWTs expire in 15 minutes. Your data is never sold or shared with anyone.

Rate limited

Every endpoint is rate-limited. Login, registration, and subscription runs all have strict per-IP controls.

HTTPS everywhere

All traffic encrypted end-to-end. API and frontend both run behind SSL. No unencrypted connections.

Ready to see it work?

Set up in under 2 minutes. Free plan included.

Start Free →