Sender authentication
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Clearwater, FL · InboxGuard for Microsoft 365
Adds onto Microsoft 365 to catch what gets through.
Microsoft Defender filters first. InboxGuard takes a second look at every message that lands in your Microsoft 365 inbox and catches the dangerous ones that slip through, minutes after they arrive.
Request a ConsultationOr call (727) 340-3921.
Built for Microsoft 365
InboxGuard protects the inbox your team already uses:
- Second look: every delivered message re-checked after arrival
- People first: extra protection for executives and finance staff
- Your choice: monitor and alert, or auto-junk the dangerous mail
- Proof included: a monthly report of everything it caught
10 checks on every new message2 verdicts side by sideMonthly proof report
Every message, ten checks
What InboxGuard looks for in every email.
Each new message is read with its full headers and scored against ten checks drawn from the tricks real scams use every day.
Brand impersonation
Messages dressed up as Microsoft, your bank, or a delivery brand get a hard second look.
Staff & executive impersonation
Mail pretending to come from your own owners, executives, and finance team gets flagged fast.
Lookalike domains
Domains built to fool the eye, with one letter swapped or one character changed, get spotted and scored.
Reply-to mismatches
Reply-to and bounce addresses are compared against the sender you see, and differences raise the score.
Disguised & risky links
Shortened, redirected, and look-alike links are unwrapped and weighed before your team clicks.
Pressure language
Urgent demands, hard deadlines, and secrecy pressure are classic scam fuel and strong scoring signals.
Payment & secrecy requests
Bank-detail changes, gift-card asks, and keep-this-between-us requests get extra scrutiny.
Risky attachments
Attachment types known for carrying booby traps are treated with suspicion from the first second.
First-time senders
A first email from a new sender earns a closer look, especially when it asks for money or credentials.
Up and running in three steps
How InboxGuard goes to work.
One approval
Your Microsoft 365 admin approves one connection. InboxGuard runs in the cloud, so employee computers stay exactly as they are and mail keeps flowing the same way.
Every message, around the clock
Every new message in every protected inbox is read with its full headers and scored against the ten checks.
Alerts and proof
Dangerous mail raises an alert right away, and in auto-junk mode it moves straight to Junk. A monthly report shows everything InboxGuard caught.
Proof on every catch
Two verdicts, side by side.
Every flagged message shows both scores together, so the value is visible at a glance.
- Microsoft’s verdict. Each catch displays Microsoft’s own ratings, the SCL and compauth results, exactly as Defender scored the message.
- InboxGuard’s verdict. Beside it sits InboxGuard’s score and the checks that fired, clear evidence of what the first filter let through.
- Monthly client report. Every month, a clear report lists each catch, ready to hand to owners, auditors, or your insurance carrier.
A second set of eyes
Built to work alongside Microsoft Defender.
InboxGuard adds a post-delivery layer to the protection you already have, tuned to your company from day one.
After-delivery protection
Defender filters at the gate. InboxGuard re-checks what reached the inbox, the exact spot where impersonation and lookalike scams do their damage.
Your company, your settings
Choose monitor-and-alert or auto-junk, set the score thresholds, name the executives and finance staff to protect, and keep a list of safe senders.
Feedback that helps Defender
With your OK, InboxGuard can report a missed phish back to Microsoft, helping Defender learn from the miss.
Put a guard on your inbox.
Talk with Online Securitys about how InboxGuard fits your Microsoft 365.