Bulk freenet email checker: check a list of freenet.de addresses at once
In short: Checks many freenet.de addresses at once: duplicates and +tag repeats flagged, and 10 mailboxes asked live at freenet's server. Limit: freenet doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
A bulk freenet email checker tests many freenet.de addresses at once. Syntax, duplicates and dead domains are flagged in your browser, then the first 10 are asked live at freenet's mail server, which rejected made-up addresses with 550 unrouteable address on 13 October and 8 November 2026. A missing mailbox comes back invalid, a real one valid, an unclear answer risky.
More than 10 freenet.de rows? Upload the whole list: every freenet row gets the same live mailbox check.
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
By SimpleVerifier Team · Last updated
How do I check a whole list of freenet addresses?
- Export the list as a CSV or copy the email column; freenet rows and every other domain can go in together.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I check if many freenet.de addresses exist?
- Paste the addresses, one per line, or a CSV column of them. Addresses at other providers are checked as normal addresses and marked.
- Press Check the freenet addresses.
- Read the flagged rows: a typo domain, a duplicate, a +tag repeat of an earlier row, or a domain with no mail server.
- Download the clean list. Notes stay on it; only rows that fail a check come off.
- The first 10 go to freenet's mail server for a live answer. Sign in with Google to check the rest with 100 free email checks.
Example
- You enter
- 6 addresses:
max.mueller@freenet.de,max.mueller+news@freenet.de,Max.Mueller@freenet.de, another freenet.de, a gmx.de and a company address. - You get
Max.Mueller@freenet.deis marked as a duplicate of row 1 and comes off;max.mueller+news@freenet.deis marked as row 1 plus a +tag and kept; the gmx.de and company rows are marked as another provider. The live check asks freenet about the freenet rows first.- Limits
- The browser pass covers the first 5,000 rows; only domains leave your device. 10 live checks a day without an account, then the free checks with a Google sign-in.
Can you check if freenet.de addresses exist in bulk?
Yes. freenet answered made-up addresses at RCPT TO with 550 unrouteable address on 13 October and again on 8 November 2026. On its own domain that means the mailbox doesn't exist, so a missing row comes back invalid.
German lists often mix freenet.de with GMX, WEB.DE and T-Online rows. Those providers screen checking servers, so their rows tend to come back risky rather than valid or invalid; see the GMX checker and the T-Online checker for what each answers. A whole list goes through the bulk verifier.
Why do freenet.de addresses go dead?
freenet's help says mail is removed after 180 days without activity and the whole mailbox is deleted after 365 days without a login. After that the address can be registered again by someone else.
So a valid result on an old freenet.de row can mean a new owner. Check where the address came from, not only whether it exists.
What does the bulk freenet check do to my list?
The pass over the whole list runs in your browser: syntax, duplicates, typo domains and role addresses. Only the unique domains are sent out, to look up mail servers and the disposable list. Rows at freenet.de are matched by the part after the @, so an address at any other domain is checked as a normal address and marked as another provider.
Then the first 10 addresses, freenet rows first, are asked live at the mail server without sending anything. Sign in with Google to check the rest with 100 free email checks. For one address with full notes, use the freenet checker.
What does each check catch on a freenet list?
| Check | Can we confirm it? | Result when it fails |
|---|---|---|
| Syntax and duplicates | Yes, in your browser | Bad syntax comes off; a duplicate is marked |
| Domain and mail server (MX) | Yes, from DNS | No mail server comes off |
| Disposable or role address | Yes | Disposable comes off; a role address is marked |
| The mailbox exists | Yes: freenet answers at RCPT TO (550 unrouteable address) | Invalid, "Mailbox not found"; an unclear reply is risky |
| Someone reads the inbox | No checker can | Use opens, replies or a small first send |
Mailbox behaviour as measured on freenet.de on 13 October and 8 November 2026.
Who uses this tool, and for what?
- German shops and newsletters
- Drop freenet.de mailboxes deleted after a year without login before a mailing.
- Lead buyers
- Check the freenet.de rows of a German list before importing it.
- List owners
- Find repeated rows and +tag copies before counting your audience.
What can’t this tool tell you?
- freenet doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
- A deleted freenet.de address can be registered again, so valid can mean a different person now owns it.
- GMX, WEB.DE and T-Online rows on the same list are checked as normal addresses and often come back risky.
- The live check covers 10 addresses without an account; risky results there can mean the check was cut short, so try again later.
- Valid means the mailbox exists today, not that anyone reads it.
Common questions
- What does 550 unrouteable address mean from freenet?
- freenet's server has nowhere to deliver that recipient, which on its own domain means the mailbox doesn't exist. Treat it as a hard bounce and remove the address.
- Does freenet delete inactive mailboxes?
- Yes. freenet's help says mail is removed after 180 days without activity and the whole mailbox is deleted after 365 days without a login.
- Is there a free bulk freenet checker?
- Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks freenet's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.
- Will the freenet users know I checked their address?
- No. The check ends after the mail server answers about the mailbox, before any message content is sent, so nothing arrives in their inbox.
- What happens to the addresses on my list that aren't freenet?
- They are checked as normal addresses and marked as another provider. The live check asks about the freenet rows first.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
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.