What you’re seeing
- Outlook pops up a Security Alert saying the name on the security certificate is invalid or does not match the name of the site.
- The alert names your public website, your web host, or an unfamiliar server instead of the mail server.
- Clicking Yes makes the alert go away until the next time Outlook starts.
- It appears for everyone in the office, or for staff whose accounts were set up recently.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- Autodiscover lookups for your domain reach the web host first, and it presents the website's certificate.
- The mail server's certificate does not include all of the names Outlook uses to contact it.
- Internal DNS directs Outlook to a server name that isn't listed on the certificate.
- A leftover autodiscover record points to an old server or hosting provider after a migration.
Why it matters
The alert itself is annoying, but the bigger problem is training. Staff who click through a certificate warning every day learn to ignore security warnings, which is exactly what attackers rely on when they intercept connections. It can also mean Outlook is sending sign-in attempts toward a server that isn't yours, and features such as out-of-office and calendar sharing may fail intermittently because of the same misdirection.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Is it dangerous to keep clicking Yes?
It is risky. In most cases the warning is caused by a misconfiguration rather than an attack, but clicking through it trains people to accept warnings that one day could be real.
Is our website affected?
Usually not. The website's certificate is fine for the website; it simply isn't the right certificate for email. We review DNS and certificates before changing anything.