harness.io - Email Domain Verification & Deliverability Report

Active Corporate Email
Organization: Harness Inc.
Mail Server: Mimecast
Verified 4 days ago

Verify email addresses @harness.io. View MX records, mail server configuration, and authentication status for Harness Inc..

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MX Records for harness.io

PriorityMail ServerIP Address
10 us-smtp-inbound-1.mimecast.com 170.10.132.141
10 us-smtp-inbound-2.mimecast.com 170.10.132.141
SMTP Status: Responding
SMTP Banner:
220 us-smtp-inbound-1.mimecast.com ESMTP; Sun, 01 Mar 2026 20:10:32 -0500

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

Email Authentication for harness.io

SPF Record Pass

v=spf1 include:_spf.google.com include:us._netblocks.mimecast.com include:mktomail.com include:spf.mandrillapp.com include:mail.zendesk.com include:sendgrid.net ip4:3.120.181.200 ip4:3.222.0.24 ip4:198.21.4.52 ip4:167.89.31.27 ip4:167.89.127.244 ip4:3.7.25.40 ip4:13.127.153.86 ip4:52.66.154.99 ip4:13.127.210.61 ip4:3.25.47.0 ip4:67.212.179.10 ip4:67.212.168.66 ip4:51.81.185.125 ip4:192.99.150.164 ip4:69.175.35.2 ip4:69.175.48.226 ip4:66.70.177.4 ip4:144.168.44.234 ip4:184.154.0.10 ip4:45.158.37.162 ip4:23.29.121.218 ip4:108.178.2.18 ip4:167.114.100.50 ip4:108.163.197.50 ip4:66.85.143.98 ip4:194.126.173.186 ip4:51.81.244.32 ip4:51.81.11.12 ip4:51.81.11.26 ip4:147.135.46.73 ip4:147.135.46.27 ip4:159.183.188.16 -all
Authorized Senders:
_spf.google.com us._netblocks.mimecast.com mktomail.com spf.mandrillapp.com mail.zendesk.com sendgrid.net

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

DMARC Record Reject

v=DMARC1; p=reject; rua=mailto:ptdkmfln@ag.us.dmarcian.com; ruf=mailto:ptdkmfln@fr.us.dmarcian.com;

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

DKIM Found

DKIM signatures were detected for harness.io, confirming that this domain cryptographically signs outgoing emails.

Authentication Summary: harness.io has full email authentication configured with SPF, DMARC, and DKIM. This provides strong protection against email spoofing and phishing. Emails sent from this domain are well-authenticated and likely to have high deliverability.

WHOIS & Domain Information

Registration Details

Domain
harness.io
TLD
.io
Created
2016-08-22
Updated
2026-01-31
Expires
2026-08-22
Domain Age
9 years

Registrar

Name
Key-Systems GmbH
IANA ID
269

Registrant Contact

Name
REDACTED
Organization
c/o whoisproxy.com
Location
REDACTED, VA, UNITED STATES

Technical Contact

Name
REDACTED
Organization
REDACTED
Location
REDACTED, REDACTED, UNITED STATES

Name Servers

  • ns-cloud-b1.googledomains.com
  • ns-cloud-b2.googledomains.com
  • ns-cloud-b3.googledomains.com
  • ns-cloud-b4.googledomains.com

How to Verify harness.io Email Addresses

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Have a mailing list full of harness.io 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 harness.io Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates harness.io 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, harness.io is the official corporate email domain for Harness Inc.. It is used for internal business communications and is not available for public registration.
No, harness.io is a corporate email domain belonging to Harness Inc., used exclusively by employees and authorized personnel.
harness.io uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
B2B marketing to harness.io requires proper consent. Corporate domains may use catch-all configurations, so verify individual addresses before sending.
Corporate domains like harness.io may use catch-all configurations. Use BulkEmailChecker's advanced verification to detect catch-all behavior.
The fastest and most accurate way to verify a harness.io 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 harness.io'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 harness.io 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 harness.io 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 harness.io 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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