When Deals Are Worth Thousands, Every Reply Matters
SentboxHQ is the invisible partner for real estate agents, executive recruiters, and enterprise closers who cannot afford to let a single email go unanswered.
Track High-Value Conversations
See exactly which emails to clients and prospects are waiting for a reply — no more guessing.
Manual, Strategic Follow-ups
Nothing is sent automatically. You decide when and how to follow up, maintaining complete control.
Close More Deals
Ensure every high-value conversation reaches a conclusion — reply received or consciously closed.
Privacy by Design — Not Just a Promise
We built SentboxHQ so you never have to trust us with your sensitive emails
No Email Access
We request read-only metadata access only. We never ask for permission to read your actual emails — because we don't need to.
Metadata Only
We only track metadata like message identifiers, headers and timestamps to determine if a reply exists. No message content and no attachments.
No AI, No Training
We don't use your data to train models. No machine learning, no "insights," no data sharing. Simple tracking only.
EU Hosted & Compliant
All data stored in Amsterdam (EU). Fully GDPR compliant. No third-party data processors. We can't access your data even if asked.
The most privacy-friendly way to never miss a reply. We don't ask for your trust — we built a system that doesn't require it.
Built For High-Stakes Professionals
SentboxHQ is designed for those where every email carries significant value and a missed reply has real financial consequences.
How It Works — No Magic, Just Results
A transparent look at our privacy-first approach
Connect Securely
Grant metadata-only access to your mailbox. We never see email content or attachments.
See Unreplied Emails
Our dashboard shows all sent emails without replies, sorted by age and priority.
Create Follow-up Plans
Build multi-step follow-ups with delays between each follow-up. Everything stays draft until you approve.
Close the Loop
When replies come in, follow-ups will auto-pause and conversations will be marked as closed. Clean dashboard, zero guesswork.
Exclusive Access Only
Start tracking your high-value emails instantly — securely, privately, and under your complete control. Fill out a few details and we'll get you set up with a premium account within 24 hours.