Skynet email checker: does this skynet.be mailbox exist?
In short: Asks Proximus's mail server whether a skynet.be mailbox exists, without sending anything, after syntax, domain, disposable and role checks. Limit: A valid result shows the server accepted the mailbox today, not that anyone reads it.
To check if a skynet.be address exists, enter it here. The checker asks the Proximus mail server that receives skynet.be mail about the mailbox at RCPT TO, then disconnects before any message is sent. It rejected a made-up address with 550 5.1.0 #5.1.0 Address rejected. on 8 November 2026, so a missing mailbox comes back invalid and an accepted one valid.
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. Check your list free nowSee pricing
Tuned for skynet.be. 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
[email protected] doesn't exist: Proximus's server rejected it.
- [email protected]
- Reason
- Mailbox not found
- Mailbox check
- SMTP, nothing sent
What this means for you
Invalid means remove it; a real mailbox would come back valid.
- Asks Proximus's server at RCPT TO
- Catch-all test with a random address first
- Catches typo domains with no mail server
- Flags disposable and role addresses
- Skynet
- skynet.be
- Proximus
By SimpleVerifier Team · Last updated
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How do I check a whole list of Skynet addresses?
- Export the list as a CSV or copy the email column; Skynet rows and every other domain can go in together.
- Upload or paste it at /verify. The first 100 email checks are free with a Google sign-in, no card.
- For every list after that, Pro includes unlimited email verification. Fair use: the first 100,000 checks a month at full speed, then slower, never cut off.
How do I check a Skynet email address?
- Type or paste one address, such as
[email protected]. - Press Check. The tool checks the syntax and domain, asks the Proximus server about a random address that can't exist, then about yours, and disconnects before anything is sent.
- Read the verdict: valid means the server accepted the mailbox and rejected the made-up one, invalid means it rejected the address, risky means the check didn't get a clear answer.
- If it comes back risky, check again later: with skynet.be that is usually a cut-short check, not a bad address.
Example
- You enter
- One address:
[email protected]. - You get
- Valid when the Proximus server accepts the mailbox after rejecting a random address; invalid ("Mailbox not found") when it answers
550 5.1.0 #5.1.0 Address rejected.; risky only when the check gets no clear answer. - Limits
- Five checks a minute per IP address, one address at a time, no account needed.
How do I check if a skynet.be address exists without emailing it?
Ask the mail server instead of the mailbox. On 8 November 2026 skynet.be published one MX host, mx.gtm-tc2.proximus.be, run by Proximus. That day a made-up skynet.be address got 550 5.1.0 #5.1.0 Address rejected. at RCPT TO through this checker.
5.1.0 is the general "bad address" code rather than the more common 5.1.1, but it came at RCPT TO for a recipient that can't exist, so a missing Skynet mailbox comes back invalid ("Mailbox not found") and an accepted one valid. This is one check on one day; we have no earlier observation for this domain.
Do skynet.be addresses still work?
Yes. Proximus's mail help page says a skynet.be or belgacom.net address still works and is used through Proximus Webmail, alongside proximus.be. Its page on leaving Proximus says customers keep their email address after the contract ends.
So an old skynet.be contact may still be reachable, or may have been closed for other reasons that only a live check shows. Re-check Belgian lists before a campaign, for example with the bulk verifier, and remove the rows that come back invalid. For telenet.be addresses, use the Telenet email checker.
What can this checker confirm at Skynet?
Each row is something the check runs on a Skynet address, and the result you can get from it.
| Check | Can we confirm it? | Result when it fails |
|---|---|---|
| Syntax (the address is written correctly) | Yes | Invalid |
| Domain and mail server (MX) | Yes | Invalid, with a typo suggestion where one fits |
| Disposable or role address | Yes | Invalid (disposable) or risky (role) |
| The mailbox exists | Yes: Skynet answers at RCPT TO (550 5.1.0 Address rejected) | Invalid, "Mailbox not found" |
| A temporary reply or timeout | No answer to read | Risky, worth checking again later |
| Someone reads the inbox | No checker can | Use opens, replies or a small first send |
Our checking server offered a made-up address and disconnected without sending, through this checker on 8 November 2026; earlier checks are dated in the text.
Who uses this tool, and for what?
- Belgian shops and newsletters
- Drop closed skynet.be mailboxes before a campaign.
- Support teams
- Catch a mistyped address, or a typo domain like skynet.bee, before you reply.
- Lead buyers
- Confirm a handful of Belgian ISP contacts before paying for or importing a list.
What can’t this tool tell you?
- A valid result shows the server accepted the mailbox today, not that anyone reads it.
- A temporary reply or a refused connection comes back risky, not invalid.
- Proximus doesn't publish how its servers answer mailbox checks; the handling here is from one check on 8 November 2026, which can change.
- One address at a time, five a minute.
Common questions
- How do I check if a skynet.be email address is valid?
- Enter it here. The checker confirms the syntax and mail server, then asks the Proximus server about the mailbox without sending. It rejected a made-up skynet.be address on 8 November 2026, so a missing mailbox comes back invalid.
- Is skynet.be email run by Proximus?
- Yes. On 8 November 2026 the skynet.be MX host was mx.gtm-tc2.proximus.be, and Proximus's help pages cover skynet.be and belgacom.net addresses in Proximus Webmail.
- Do I keep my skynet.be address if I leave Proximus?
- Proximus says customers keep their email address after the contract ends. Whether a given mailbox is still open is what a live check shows.
- What does 550 5.1.0 Address rejected mean from skynet.be?
- The server refused that recipient. Coming at RCPT TO for an address on its own domain, treat it as a hard bounce and remove the address.
- Is this 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, or use a monthly plan.
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
Plans from $9 a month, 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.