kolabnow.com - Email Domain Verification & Deliverability Report

Active Free Email Provider
Organization: Kolab Systems AG
Mail Server: kolabnow.com
Verified 4 days ago

Real-time verification data for Kolab Systems AG (kolabnow.com). A Free Email Provider .

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MX Records for kolabnow.com

PriorityMail ServerIP Address
10 mx01.kolabnow.com 212.103.80.153
10 mx03.kolabnow.com 212.103.80.154
10 mx02.kolabnow.com 212.103.80.154
SMTP Status: Responding
SMTP Banner:
220 ext-mx-in012.mykolab.com ESMTP Postfix

kolabnow.com uses kolabnow.com mail servers, which means emails are processed through kolabnow.com infrastructure with their built-in spam filtering and security controls.

Email Authentication for kolabnow.com

SPF Record Pass

v=spf1 mx a:mx.kolabnow.com mx:apheleia-it.ch -all

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of kolabnow.com.

DMARC Record Quarantine

v=DMARC1; p=quarantine; adkim=s; aspf=s; rua=mailto:dmarc-rua@apheleia-it.ch; ruf=mailto:dmarc-ruf@apheleia-it.ch

DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail authentication checks.

DKIM Not Detected

DKIM detection is limited from external scanning. The domain may use DKIM with selectors not covered by our scan.

Authentication Summary: kolabnow.com has SPF and DMARC configured. This provides good protection against email spoofing. Senders can expect reliable email delivery to this domain.

WHOIS & Domain Information

Registration Details

Domain
kolabnow.com
TLD
.com
Created
2014-11-24
Updated
2025-10-26
Expires
2026-11-24
Domain Age
11 years

Registrar

Name
TUCOWS DOMAINS, INC.
IANA ID
69

Registrant Contact

Name
Contact Privacy Inc. Customer 0138879389
Organization
Contact Privacy Inc. Customer 0138879389
Location
Toronto, ON, CANADA

Name Servers

  • sec1.rcode0.net
  • sec2.rcode0.net

About kolabnow.com Email Verification

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.

How to Verify kolabnow.com Email Addresses

Need to check if an email address at kolabnow.com actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to kolabnow.com's mail servers to confirm the mailbox is real, active, and able to receive your message. No test email is ever sent, so your sender reputation stays protected.

Verify a Single kolabnow.com Email
Use BulkEmailChecker's free email verification tool to instantly validate any kolabnow.com address. You'll get a complete deliverability report including mailbox existence, catch-all detection, disposable domain flagging, and risk scoring, all in under 3 seconds.

Verify a List of kolabnow.com Emails in Bulk
Have a mailing list full of kolabnow.com addresses? Upload your CSV or TXT file to BulkEmailChecker and verify thousands of email addresses in minutes. Our bulk verification engine runs 30+ checks per address including syntax validation, DNS resolution, SMTP handshake, and spam trap detection. Clean your list before every campaign to keep bounce rates below 2% and protect your sender score. See bulk pricing.

Verify kolabnow.com Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates kolabnow.com email addresses at the point of entry, blocking invalid, disposable, and risky addresses before they enter your database. Integrate with a single API call and prevent bad data at the source.

Frequently Asked Questions

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.
The fastest and most accurate way to verify a kolabnow.com email address is to use BulkEmailChecker's free email verification tool. Simply enter the full email address and our system performs SMTP-level validation by connecting directly to kolabnow.com's mail servers. You'll get instant results showing whether the mailbox exists, is deliverable, and is safe to send to, all without sending a single email.
Yes. BulkEmailChecker uses SMTP verification to check if a kolabnow.com mailbox exists without ever delivering an email. Our system connects to the domain's mail server, performs an SMTP handshake, and queries the mail server to confirm whether the recipient address is valid. This process is completely invisible to the email recipient and does not affect your sender reputation.
Sending to invalid email addresses causes hard bounces, which directly damage your sender reputation. Internet Service Providers (ISPs) and email providers track your bounce rate, and if it exceeds 2%, your emails may start landing in spam folders or get blocked entirely. Verifying kolabnow.com addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
BulkEmailChecker's bulk verification service lets you upload a CSV or TXT file containing thousands of kolabnow.com email addresses and verify them all at once. Each address goes through 30+ verification checks including syntax validation, DNS/MX lookup, SMTP verification, disposable domain detection, and spam trap identification. Results are typically ready within minutes and can be downloaded as a clean, verified list.
Email verification is the process of confirming that an email address is real, properly formatted, and capable of receiving messages. It matters because sending to invalid addresses causes bounces, damages your sender reputation, wastes marketing budget, and can get your sending IP blacklisted. BulkEmailChecker verifies addresses at the SMTP level, the most accurate method available, ensuring your emails reach real people.
MX (Mail Exchange) records are DNS entries that specify which mail servers are responsible for receiving email for a domain. When you send an email, your mail server looks up the recipient domain's MX records to find where to deliver the message. If a domain has no MX records, it cannot receive email. BulkEmailChecker checks MX records as part of every verification to confirm the domain is configured for email delivery.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, regardless of whether the specific mailbox exists. This makes it harder to verify individual addresses because the server always responds positively. BulkEmailChecker detects catch-all configurations and flags them in verification results so you can make informed decisions about sending to those addresses.
Yes. BulkEmailChecker offers a real-time email verification API that you can integrate into signup forms, CRM systems, lead capture tools, and any application that collects email addresses. The API validates addresses at the point of entry, blocking invalid, disposable, and risky emails before they enter your database. Integration takes just a single API call with response times under 3 seconds.

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