Outlook and Hotmail email checker: what can be confirmed
This Outlook email checker tests an outlook.com, hotmail.com, live.com or msn.com address for broken syntax, typo domains like hotmal.com, a missing mail server, and disposable or role use. Microsoft's consumer servers don't give a mailbox answer that can be treated as confirmation, so an address that passes comes back risky, not valid. Nothing is sent.
Tuned for outlook.com, hotmail.com, live.com, msn.com. Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
Sample result
name@outlook.com passes every check that can run, but Microsoft won't confirm it.
- name@outlook.com
- Reason
- Provider hides mailbox status
- Mailbox check
- Not run: provider won't confirm
What this means for you
Risky means unconfirmed, not bad; let where the address came from decide.
- Catches typo domains with no mail server
- Flags disposable and role addresses
- Says when Microsoft won't confirm a mailbox
- Full mailbox check for Microsoft 365 domains
- Outlook
- Hotmail
- Live, MSN
By SimpleVerifier Team · Last updated
How do I check an Outlook or Hotmail address?
- Type or paste one address, such as
name@outlook.comorname@hotmail.com. - Press Check. Syntax, domain, mail server, disposable and role checks run first.
- Read the verdict. Invalid means the address can't receive mail. Risky with "Provider hides mailbox status" means it passed everything that can be checked, but Microsoft didn't confirm the mailbox.
- For a Microsoft 365 company address, the same box runs a full mailbox check, because business tenants answer differently.
Example
- You enter
- One address:
name@outlook.com. - You get
- Risky, with the reason "Provider hides mailbox status": syntax, domain, disposable and role checks passed, but Microsoft's consumer servers don't confirm mailboxes, so no mailbox probe is run. A typo domain with no mail server, such as
name@hotmal.com, comes back invalid with a "did you mean hotmail.com?" suggestion. - Limits
- Five checks a minute per IP address, one address at a time, no account needed.
Can you verify a Hotmail or Outlook address without sending an email?
Only partly, and this checker says so. Consumer Microsoft mail (outlook.com, hotmail.com, live.com, msn.com) runs on hosts ending in olc.protection.outlook.com, per DNS on 22 October 2026. Those servers can reply 550 5.5.0 Requested action not taken: mailbox unavailable, but the same reply has been reported for real accounts that were locked, and Microsoft publishes no reference for what its consumer servers say to a mailbox check. So the checker doesn't open a mailbox probe for these domains and returns risky, with the reason "Provider hides mailbox status", once everything else passes.
What it still catches is most of what bounces from a form or a typed list: broken syntax, typo domains (a domain with no mail server that is close to hotmail.com gets a "did you mean" suggestion), throwaway domains and role addresses. The full background is in verifying Outlook and Hotmail addresses.
Is a Microsoft 365 company address checked the same way?
No. A business on Microsoft 365 publishes an MX ending in mail.protection.outlook.com, and when all its mailboxes are in Exchange Online, Microsoft rejects unknown recipients with 550 5.4.1 Recipient address rejected: Access denied, documented in its Directory-Based Edge Blocking guide. Those domains get a full mailbox check here, catch-all test first, like any other company domain.
Some 365 domains accept every address (during migrations, or behind a security gateway), and those come back risky as catch-all. Check which system a domain uses with the MX lookup, or put the address in the general email checker.
Should I send to an Outlook address that comes back risky?
Decide by where it came from. A Hotmail address that signed up on your own form recently, ideally confirmed by double opt-in, is a reasonable send. One from an old list is a bigger risk: Microsoft says it closes an Outlook.com mailbox if nobody signs in for a year (Microsoft Support), so Hotmail-heavy lists decay quickly.
Send old Microsoft addresses in a small batch first and suppress every hard bounce. For a whole file, the email list cleaner removes duplicates, bad syntax and dead domains in your browser before anything else.
Who uses this tool, and for what?
- Support and sales teams
- Catch a mistyped domain such as
hotmal.com, which has no mail server, before replying to a lead instead of waiting for the bounce. - B2B prospectors
- Paste a company address on Microsoft 365 and get a real mailbox answer, since business tenants reject unknown recipients.
- List owners
- See why consumer Microsoft addresses land in the risky bucket, and plan a cautious first send for them.
What can’t this tool tell you?
- It does not confirm that an outlook.com, hotmail.com, live.com or msn.com mailbox exists. Those come back risky once the other checks pass.
- Some regional Microsoft domains, such as hotmail.fr, are probed like any other domain, and may come back risky as catch-all.
- Microsoft 365 domains behind a security gateway answer by the gateway's rules, which often accept everything.
- One address at a time, five a minute.
Common questions
- Why does my Outlook address show as risky and not valid?
- Because Microsoft's consumer mail servers don't give an answer that can be treated as confirmation of the mailbox. Rather than guess valid, the checker reports risky once syntax, domain, disposable and role checks pass.
- Can it still tell me an Outlook address is invalid?
- Yes, when the problem is something that can be checked: broken syntax, a typo domain with no mail server, a disposable domain. Those come back invalid. It won't call a well-formed hotmail.com address invalid just because Microsoft didn't confirm it.
- Are hotmail.com, outlook.com and live.com the same service?
- Yes. They are consumer Microsoft accounts on the same mail system; their MX records all end in olc.protection.outlook.com. msn.com is too.
- How long before an unused Hotmail address stops working?
- Microsoft's support pages say an Outlook.com mailbox is closed and its email deleted if nobody signs in at least once in a year, and the Microsoft account is closed after two years without a sign-in.
- What does 550 5.4.1 Recipient address rejected: Access denied mean?
- It's Microsoft 365 rejecting an address that doesn't exist in the organization. Microsoft documents it as 'The recipient's address doesn't exist'. It is not a block on your IP.
- Is this Outlook checker free?
- Yes, five checks a minute with no account. For a whole list, sign in with Google for 100 free email checks, no card.
Sources
That was one address. Most people have a list.
The free checker does five addresses a minute, one at a time — fine for spot-checking, useless for a CSV of 40,000.
- Upload a CSV up to 100,000 rows
- Valid, risky and invalid exported as separate files
- Repeat checks free for 14 days, no new connections
One plan, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.