Yes. You can verify any @Kolabnow.com address in real time with a direct SMTP handshake that provides 99.7% accuracy. Kolabnow.com is operated by Kolab Systems AG, runs 3 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.
kolabnow.com publishes 3 MX records. The primary mail exchanger is mx01.kolabnow.com, hosted by kolabnow.com, 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 | mx01.kolabnow.com | 185.254.79.31 | Reachable |
| 20 | mx03.kolabnow.com | 185.254.79.40 | Reachable |
| 20 | mx02.kolabnow.com | 185.254.79.33 | Reachable |
220 postfix.kolabnow.com ESMTP PostfixYes. kolabnow.com is a valid email provider, operated by Kolab Systems AG. 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 Kolabnow.com'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 kolabnow.com mailboxes before you mail them.
Mistyped kolabnow.com 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 kolabnow.com addresses raises every rate that matters: opens, clicks, and replies.
Kolabnow.com is Kolab Systems AG, registered through TUCOWS.COM, CO. and first seen Nov 24, 2014.
kolabnow.com is a privacy-focused groupware and email service operated by Kolab Systems AG in Zurich, Switzerland. KolabNow provides paid email, calendar, contacts, and collaboration tools, all hosted in Switzerland under strict Swiss privacy laws.
kolabnow.com implements SPF, DKIM, and DMARC for outbound email. All data is stored in Switzerland under Swiss FADP regulations. The service uses open-source Kolab groupware technology.
The kolabnow.com mail servers validate recipients and reject invalid addresses. The domain does not function as catch-all. Security-focused filtering protects the privacy-conscious user base.
For delivery to kolabnow.com, authenticate with SPF, DKIM, and DMARC. KolabNow users value privacy and security. Well-authenticated messages deliver reliably.
Upload a CSV or TXT list of Kolabnow.com 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 Kolabnow.com 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, kolabnow.com is a valid email domain operated by Kolab Systems AG in Switzerland. It provides privacy-focused groupware and email services.
No, kolabnow.com is a permanent paid email and groupware service based in Switzerland with strong privacy protections.
Kolabnow.com operates Kolab groupware servers in Switzerland, providing email, calendaring, and collaboration tools.
Yes, with consent. Kolab Now users are privacy-focused professionals who expect transparent communication.
Kolabnow.com addresses can be verified via SMTP with standard accept/reject responses.
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 kolabnow.com's mail servers, the same engine that has verified billions of addresses since 2012.
Other free email provider domains we have audited.