Mailbox provider · iCloud Mail
How to verify an iCloud email address
Can you verify an iCloud Mail address?
Yes. A mailbox check asks iCloud Mail's mail server whether the @icloud.com mailbox exists and disconnects before any email is sent. iCloud Mail rejected a made-up address in our 28 October 2026 checks, so a missing mailbox comes back invalid and a real one valid. Temporary replies and timeouts stay risky until checked again.
Tuned for icloud.com, me.com, mac.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.
Paste your @icloud.com addresses (a mixed list is fine) and check them together.
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iCloud Mail verification facts
| Primary mail server (MX) | mx01.mail.icloud.com (run by Apple) |
|---|---|
| Made-up address, 23 October 2026 | risky in both rounds, about 10.5 hours apart ("Provider hides mailbox status") |
| Mailbox probe | Yes: asked at the SMTP RCPT TO step, then we disconnect before any message is sent. |
| Catch-all behaviour | Not catch-all: a made-up address was rejected, so a rejection means the mailbox is missing. |
| Typical results | Valid ("Mailbox exists") or invalid ("Mailbox not found"). Risky ("Server would not confirm") when the server gives a temporary reply or times out. |
| Always checked | Syntax, the domain's mail servers (MX), disposable domains, role inboxes (info@, sales@) and likely typos. |
| A list of addresses | Paste or drop it above: the first 100 checks are free with a Google sign-in, no card, results as a CSV. |
| Single-address tool | iCloud checker |
From our checker's code and our own dated measurements. Anything we cannot confirm is reported as risky, never valid. Last updated .
How do I check if a @icloud.com address exists? Paste the address into a mailbox checker such as SimpleVerifier's: it asks iCloud Mail's mail server about the mailbox at the SMTP RCPT TO step and disconnects before any email is sent. iCloud Mail rejected a made-up @icloud.com address in our 28 October 2026 checks, so a missing mailbox comes back invalid and a real one valid; anything the server won't confirm comes back risky.
Can you verify @icloud.com addresses?
YesYes. @icloud.com answers mailbox checks one address at a time.
The checker opens an SMTP conversation with icloud.com's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
Mailbox existsMailbox not foundServer would not confirmWhat we can and cannot confirm at @icloud.com
We can confirm
- The address is written correctly (syntax), and the domain publishes working mail servers (MX).
- Whether it is a disposable or role address (info@, sales@) or a likely typo of a bigger domain.
- Whether the @icloud.com mailbox exists: iCloud Mail answers at RCPT TO, so a rejection is invalid ("Mailbox not found") and an acceptance is valid.
We cannot confirm
- A temporary reply or timeout from iCloud Mail. Those come back risky ("Server would not confirm") and are worth checking again later.
- That a valid mailbox will stay valid. Old consumer addresses go stale, so re-check before a big send.
- Whether a person reads the inbox, wants your email or agreed to receive it. No checker can see that.
Anything we cannot confirm comes back risky, never valid.
What we measured at icloud.com
Measured by SimpleVerifier on 23 October 2026 through our production checker and public DNS. No message was sent and no real person's address was used.
| Made-up address, checked twice ~10.5 hours apart | risky both times ("Provider hides mailbox status") |
|---|---|
| Primary mail server (MX) | mx01.mail.icloud.com |
| Mail host | Apple |
| DMARC policy | p=quarantine |
| SPF | published, ends redirect |
| MTA-STS | not published |
| DNSSEC | not signed |
At the time of this study our checker did not probe iCloud. Since 28 October 2026 it does: Apple rejects an unknown icloud.com, me.com or mac.com user with 550 5.1.1, which comes back invalid ("Mailbox not found").
Sources: How 51 mailbox providers answer verification checks, SPF, DMARC, MTA-STS and DNSSEC at 51 mailbox providers, both with CSVs (CC BY 4.0). All datasets: research.
Where your @icloud.com addresses live
Already paying another verifier?
iCloud addresses can be checked without sending. Since 28 October 2026 our live checker probes icloud.com, me.com and mac.com: Apple rejects an unknown user with 550 5.1.1 at RCPT TO, which comes back invalid, and accepts an existing mailbox, which comes back valid. me.com and mac.com use the same servers. A catch-all test runs first, and a deferral or a 5.7.x reply is a refusal of the checker, not a dead mailbox, so those results stay risky.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. See pricing
Live DNS snapshot: icloud.com
Checked 6 November 2026, 09:27 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for icloud.com goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
- 10
mx02.mail.icloud.comiCloud Mail - 10
mx01.mail.icloud.comiCloud Mail
First MX host belongs to iCloud Mail.
v=spf1 redirect=_spf.icloud.comp=quarantine: meets the requirement and enforces it.
v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]Look up any other domain with the MX lookup or the email provider lookup.
iCloud Mail at a glance
| Operated by | Apple Inc., Cupertino, CaliforniaSource: iCloud terms and conditions |
|---|---|
| Same mailbox system | Long-standing accounts can use @icloud.com, @me.com and @mac.com addresses; all three published mx01 and mx02.mail.icloud.com on 7 October 2026Source: Apple: me.com and mac.com addresses |
| MX hosts | mx01.mail.icloud.com and mx02.mail.icloud.comObserved 7 October 2026 (dig MX) |
| Answer to a made-up address | A made-up address was rejected with 550 5.1.1 at RCPT TO and came back invalid ("Mailbox not found"); an existing mailbox came back validObserved 28 October 2026 (SimpleVerifier's live checker on a made-up recipient, no message sent) |
| Address rule | Up to three @icloud.com aliases per account, delivering to the same inboxSource: Apple: iCloud Mail aliases |
| Address rule | iCloud+ subscribers can generate unlimited random Hide My Email addresses that forward to their real inboxSource: Apple: Hide My Email |
| Inactive accounts | Apple may terminate an account inactive for one year, after 30 days' notice by emailSource: iCloud terms and conditions |
Reading an iCloud rejection
Apple answers the mailbox question for a checker it accepts: since 28 October 2026 ours gets 550 5.1.1 for an unknown icloud.com user and an acceptance for a real one. Apple also screens connecting servers, and a refusal of the checker usually comes as a 5.7.1. RFC 3463 defines the x.7.x class as security or policy status, so that reply says nothing about whether the mailbox exists.
The result is the most common false invalid in email verification: a tool that maps every 550 to "does not exist" will mark real Apple users dead. A careful verifier reads the enhanced code, returns unknown for 5.7.x, and retries from an IP with reverse DNS and a clean reputation. You can test any verifier this way: put a real iCloud address you own through it and see whether it comes back invalid.
me.com, mac.com and aliases
Apple's support page explains that people who had a working @mac.com address in 2008 and moved through MobileMe to iCloud can use @icloud.com, @me.com and @mac.com addresses with one account, and that accounts created before September 2012 have both @me.com and @icloud.com. The same person can therefore appear on a list under two or three Apple domains. There is no published rule that maps one to another, so de-duplicate only on evidence such as a shared customer ID.
Apple also allows up to three iCloud Mail aliases per account. We could not find Apple documentation on plus addressing for iCloud, so we do not recommend stripping plus tags from iCloud addresses when normalising a list.
Hide My Email addresses are real, and deliberate
iCloud+ subscribers can generate unique, random addresses with Hide My Email, as many as they need, and mail to them is forwarded to their real inbox. A random-looking address on your list may be one of these rather than a typo or a bot. It belongs to a real person who chose not to share their main address, so verify it like any other and treat a later hard bounce as final rather than retrying.
Apple's iCloud terms allow it to terminate an account that has been inactive for one year, with 30 days' notice, so long-dormant iCloud addresses deserve a fresh check before a campaign; see how often to re-verify your list.
Common questions
- How do I check if a @icloud.com address exists?
- Paste the address into a mailbox checker such as SimpleVerifier's: it asks iCloud Mail's mail server about the mailbox at the SMTP RCPT TO step and disconnects before any email is sent. iCloud Mail rejected a made-up @icloud.com address in our 28 October 2026 checks, so a missing mailbox comes back invalid and a real one valid; anything the server won't confirm comes back risky.
- Can I check a list of iCloud Mail addresses for free?
- Yes. Paste the list or drop a CSV on this page and sign in with Google: the first 100 addresses are checked free, no card, once per account, and the results download as a CSV. Single addresses can be checked on this page without an account, five a minute.
- Does checking an iCloud Mail address send them an email?
- No. The checker opens a connection to the mail server, asks about the mailbox at the RCPT TO step and disconnects before any message is sent. The owner of the address is not notified.
- Why does my iCloud Mail address come back risky?
- Usually because the check was cut short: iCloud Mail's server gave a temporary reply or timed out, or today's free-tool capacity ran out. iCloud Mail normally answers clearly, so check it again later before you drop it.
- Can you verify an iCloud email address without sending?
- Usually, yes. Since 28 October 2026 our live checker probes icloud.com, me.com and mac.com: Apple rejects an unknown user with 550 5.1.1, which comes back invalid, and an existing mailbox comes back valid. A deferral, a catch-all result or a 5.7.1 rejection (which concerns the checking server, not the mailbox) stays risky.
- Are me.com and mac.com addresses still valid?
- Yes, for long-standing accounts. Apple says people who kept a mac.com address through MobileMe can use icloud.com, me.com and mac.com addresses with their iCloud account, and all three domains use the same mx01 and mx02.mail.icloud.com servers.
- Why did my verifier mark a real iCloud address invalid?
- Most likely Apple rejected the verifier's IP with a 5.7.x policy code and the verifier read it as a missing mailbox. RFC 3463 defines x.7.x codes as security or policy status, so the honest result is unknown, not invalid.
- What happens to an inactive iCloud account?
- Apple's iCloud terms say it may terminate an account that has been inactive for one year, after giving 30 days' notice by email.
Related tools
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