The wrong recipient is one autocomplete away.
Sendasta catches every email going to the wrong person — the competitor, the former client, the John Smith nobody meant to email — and warns you the moment before it lands. One last check, so you can catch the mistake yourself.
Free for personal use · No credit card · Works on Outlook web, desktop, and Mac
You start typing a name. Outlook fills in the rest. You attach the file, hit send, and a second later realize the autocomplete grabbed the wrong contact — the one with the similar last name, the old client, the personal address. By then it's gone.
Sendasta catches it before it leaves your outbox.
Three steps. Five minutes.
Install
Add Sendasta to your own Outlook in a few clicks, or roll it out to your whole team through Microsoft 365 Admin. Works on Outlook web, desktop, and Mac. No technical knowledge required.
Set your rules
Tell Sendasta which domains to flag — competitors, former clients, personal addresses, anything that should never receive your work email. Add no-combine pairs for clients who must stay separated. Takes about two minutes.
Send normally
When you click Send, Sendasta checks your recipients against your rules. If something looks off, it pauses and shows you why. If everything checks out, the email goes. You won't notice it most days. The day you do, it's worth it.
What it actually does
Catches recipients that don't belong
When the recipients on an email don't match — a competitor's domain mixed with your client's, a personal address mixed with a corporate one — Sendasta pauses the send and asks you to confirm. Works on every Send and every Reply All.
- Checks every Send, including Reply All
- Works on Outlook web, desktop, and Mac
- Flags mismatched company domains
Enforces a rule, not a hope
Add the domains you don't want emails going to, ever. Competitors. Former clients. The journalist's address you accidentally added six months ago. Sendasta requires a deliberate "Send Anyway" — no silent slips.
- Requires a deliberate "Send Anyway" to override — no silent slips
- No-combine pairs for competing clients who must never share an email
- Trusted pairs to silence alerts for known-safe combos
One deployment, whole team
Roll out through Microsoft 365 Admin in about five minutes. No per-user setup, no end-user action. Everyone protected automatically.
- Deploy once through Microsoft 365 Admin Center
- No end-user action or setup required
- Works on Outlook web, desktop, and new Outlook for Mac
The numbers nobody likes to talk about
65%
of organizations had data leave through email by employee mistake in the past year.
1 in 3
employees has sent an email to the wrong person.
27%
of data protection incidents involve misdirected emails.
47%
of misdirected emails are discovered by the recipient, not by security tools.
$4.45M
average cost of a data breach involving misdirected email.
One click is all it takes.
One misdirected email can end a client relationship that took years to build. Sendasta protects your whole team for $99 per month.
Simple, fair pricing.
For individuals who want to stop misdirected emails in their own inbox. No account, no sign-in.
- Real-time conflicting-domain warning
- One-click enable / disable
- Works on Outlook web, desktop & Mac
- Self-install in under 5 minutes
No account needed. Works immediately.
Everything in Personal, plus team-wide rules and a central admin console.
- Everything in Personal, plus:
- Block specific domains for your whole team
- Internal-domain bypass list
- No-combine pairs for conflicting clients
- Trusted pairs to silence false alarms
- Cc & Bcc recipient checking
- Central admin console — set rules once
- Automatic rollout via Microsoft 365 Admin
- Priority email support
14-day free trial, then $99/month. Cancel anytime.
Need something custom for a larger team or specific compliance requirements? Email info@sendasta.com — we'll figure it out.
For IT and admins
Deploy Sendasta to everyone's Outlook in about five minutes through Microsoft 365 Admin Center — no end-user action, no per-person configuration. Each person can configure their own watched domains, no-combine pairs, and trusted contacts after install.
Questions? A real person answers.
Pricing questions, custom setup, integration questions — send a message and you'll hear back within one business day.
We respond within 1 business day