Opt-Inbox,
your inbox without the
Spam filters deliver every harmless message. Opt-Inbox delivers ONLY the ones from senders you’ve approved. Say goodbye to the newsletters, the persistent vendors, and the cold pitches. Recipients decide once who reach them, and can change their minds anytime.
DEPLOYS IN
< 48 hrs
VOLUME REDUCTION
~33%
WANTED MAIL LOST
0%
DID YOU KNOW?
// THE PROBLEM //
Your email security does its job.
The remaining 41% is the problem.
Unwanted newsletters
The ones you signed up for once. The ones you didn't. Either way, they don't stop arriving.
Persistent marketing
The fifth follow-up. The "circling back." The vendor who won't take silence for an answer.
Annoying invites
Webinars, drop-ins, "quick syncs." Calendar pollution disguised as networking.
First-time senders
Strangers reaching out cold. Some are real. Most aren't. You shouldn't have to sort them.
// THE SOLUTION //
Sender status changes only when the recipient says so.
Opt-Inbox sits between your existing email security and the user’s mailbox. Approved senders deliver. Unknown senders wait. No probability scoring and no machine guessing. Every decision is deterministic, made by the person who owns the inbox.
STEP 1 — CLEAR
Security clears the message
Whatever runs today (O365 Defender, Proofpoint, Mimecast, Barracuda, Sophos, etc.) keeps doing its job. Opt-Inbox doesn’t replace it.
STEP 2 — CHECK
Sender identity is verified
Approved senders deliver immediately. Unknown senders wait in a clean queue. Blocked senders are dropped silently.
STEP 3 — DECIDE
Only wanted mail arrives
Recipients approve or block once. The decision holds until they change it. Deterministic and 100% self-managed.
APPROVAL FLOW
Trust built automatically
- People you email get auto-approved (outbound trust capture)
- Admins pre-approve mission-critical vendors and systems
TRUST MODEL
Zero Trust by default
- Unknown senders are silently rejected, no bounces or clutter
- One-time challenge confirms a human, then approval is permanent
- No probability scoring or machine guessing, every decision is yours
// RESULTS //
Measured across
Sendio customers
CLEAN INBOX
Volume reduction
Inbound mail volume is cut in third on average, without losing a single wanted message.
PRODUCTIVITY
Saved per employee, per day
Previously spent triaging, deleting, and unsubscribing. Recovered.
LIFESTYLE
Reclaimed per year
Two full work weeks per employee, returned to the work that actually matters.
// DEPLOYMENT //
Pick the install path that
fits your stack.
Either model works behind the scenes. Your team’s daily experience is the same — the difference is what your security architecture looks like underneath.
Behind your existing email security
Sits behind O365 Defender, Proofpoint, Mimecast, Barracuda, Sophos, TrendMicro, and others. No rip-and-replace.- Infrastructuremaintained as-is
- MX recordsunchanged
- Cost profilesmall upgrade
Within Sendio’s full Email Security suite
Pair Opt-Inbox with Sendio’s Email Security Gateway. One platform, one admin surface, one bill.- Admin surfacesingle pane
- Settingsunified
- Pricingone stop
// SUPPORT //
Talk to humans,
not bots, for support.
When something needs attention, you can reach a person who knows the product.
Human agents only.
Every support interaction is handled by a Sendio engineer who understands the product end-to-end.
// FAQS //
Common questions,
direct answers.
Is Opt-Inbox a spam filter?
Will it improve my security posture?
Indirectly, yes. By holding unknown senders, Opt-Inbox neutralizes social engineering attempts that bypass traditional filters — including spear-phishing, BEC, and pretexting from first-time senders.
Can I use Opt-Inbox alongside my existing spam filter?
That’s the recommended setup. Opt-Inbox is designed to complement existing security tooling — Microsoft 365 Defender, Proofpoint, Mimecast, Barracuda, and others. No rip-and-replace required.
How does Opt-Inbox decide what I want to see?
It doesn’t decide — you do. Recipients approve or block senders once. Outbound mail you send automatically trusts the recipient. Directory contacts are pre-approved. Everything else waits for your explicit decision.
How are senders added to my approved list?
Three ways: (1) you reply to or email someone (auto-approved), (2) they’re in your company directory (auto-approved), (3) you manually approve them from the holding queue.
What happens when someone new emails me?
Their message is held in a clean queue, separate from your inbox. They don’t get a bounce. You review the queue on your schedule — typically once a day, takes about a minute.
Does it make managing email easier?
Customer data shows about 20 minutes saved per employee per day — roughly 50% reduction in inbound volume, with zero loss of wanted mail. Most users review the queue once daily.
Do I have to check the holding queue separately?
You can, but you don’t have to. Opt-Inbox can deliver a once-daily digest of pending senders directly to your inbox. Approve, block, or ignore — all from one summary.
What about machine-generated email — reports, tickets, alerts?
Pre-approve them once at the admin level (by domain, sender, or pattern) and they bypass the queue entirely. Critical operational mail is never delayed.
Can I exclude individuals from my approved senders?
Yes. Block decisions are deterministic and permanent. The blocked sender will never reach your inbox or queue again — and they never know they’ve been blocked.
Do my approved senders need to be the same as my co-workers?
No. Each user maintains their own decisions. Admin-level pre-approvals (e.g., key vendors) apply to everyone, but personal trust lists are private.
Are there other business efficiencies to gain?
Yes — reduced phishing exposure, lower help-desk volume from email-related tickets, and meaningful productivity recovery. Most customers see ROI within the first quarter.
Do I have to roll it out to everyone at once?
No. Opt-Inbox supports phased rollout by team, department, or domain. Most customers start with a pilot group and expand after 2–4 weeks.
Can I review pending email on mobile?
Yes. The holding queue is accessible via web, mobile browser, and an optional summary email — no separate app required.
// READY WHEN YOU ARE //
Reclaim up to thirteen work days per employee, per year.
See how Opt-Inbox gives your team back their inbox — and what it would take to deploy in your environment.