Yes. You can verify any @Posteo.de address in real time with a direct SMTP handshake that provides 99.7% accuracy. Posteo.de is operated by Posteo e.K., runs 4 mail servers, enforces 2 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
posteo.de publishes 4 MX records. The primary mail exchanger is mx03.posteo.de, hosted by posteo.de, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | mx03.posteo.de | 185.67.36.70 | Reachable |
| 10 | mx01.posteo.de | 185.67.36.61 | Reachable |
| 10 | mx02.posteo.de | 185.67.36.73 | Reachable |
| 10 | mx04.posteo.de | 185.67.36.71 | Reachable |
220-mx03.posteo.de ESMTP PostfixYes. posteo.de is a valid email provider, operated by Posteo e.K.. Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to Posteo.de's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Free inboxes get abandoned constantly. Verification drops the dead posteo.de mailboxes before you mail them.
Mistyped posteo.de addresses fail a real SMTP check, so they never turn into a hard bounce.
A clean list keeps your bounce rate low, and a low bounce rate is what protects inbox placement on a big send.
Mailing only live posteo.de addresses raises every rate that matters: opens, clicks, and replies.
Posteo.de is Posteo e.K..
posteo.de is a German privacy-focused email service operated by Posteo e.K., based in Berlin. Posteo offers paid email accounts powered by 100% green energy, with anonymous registration, no advertising, and strong encryption. The service emphasizes sustainability, privacy, and open-source principles.
posteo.de implements SPF, DKIM, and DMARC authentication. The service encrypts all stored data, supports PGP, and complies with strict German and EU GDPR data protection requirements. Posteo does not log IP addresses and allows anonymous payment.
The posteo.de mail servers enforce recipient verification and reject invalid addresses. The domain does not operate as catch-all. Security-focused filtering protects the privacy-conscious user base.
For delivery to posteo.de, authenticate with SPF, DKIM, and DMARC. Posteo users are privacy-focused. German providers apply strict filtering. Clean, well-authenticated messages deliver reliably.
Upload a CSV or TXT list of Posteo.de addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Posteo.de address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
Yes, posteo.de is a valid email domain operated by Posteo e.K. in Berlin, Germany. Posteo is a privacy-focused, green email provider powered by renewable energy.
No, posteo.de is a permanent paid email service focused on sustainability, privacy, and encryption.
Posteo operates its own mail servers in Germany, powered entirely by green energy from Greenpeace Energy.
Yes, with consent and GDPR compliance. Posteo users are environmentally and privacy conscious.
Posteo addresses can be verified via SMTP. As a paid service, addresses are generally valid and actively used.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with posteo.de's mail servers, the same engine that has verified billions of addresses since 2012.
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