caltech.edu - Email Domain Verification & Deliverability Report

Active Education Email
Organization: California Institute of Technology
Mail Server: iphmx.com
Verified 3 days ago

Verify email addresses @caltech.edu. View MX records, mail server configuration, and authentication status for California Institute of Technology.

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MX Records for caltech.edu

PriorityMail ServerIP Address
10 mx1.caltech.iphmx.com 68.232.137.147
10 mx2.caltech.iphmx.com 68.232.137.147
SMTP Status: Responding
SMTP Banner:
220 esa.caltech.iphmx.com ESMTP

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

Email Authentication for caltech.edu

SPF Record Pass

v=spf1 ip4:131.215.0.0/16 ip4:134.4.0.0/16 ip4:192.100.16.0/24 ip4:198.129.208.0/23 ip4:208.69.128.0/22 ip4:199.188.184.0/22 ip4:198.202.125.128/25 ip4:74.122.104.0/22 ip4:72.10.184.102 ip4:72.10.184.103 include:spf.protection.outlook.com include:sendgrid.net include:mktomail.com include:spf.dynect.net include:cust-spf.cashnet.com include:amazonses.com include:_spf.createsend.com include:_spf01.mykronos.com include:_s0.caltech.edu ?all
Authorized Senders:
spf.protection.outlook.com sendgrid.net mktomail.com spf.dynect.net cust-spf.cashnet.com amazonses.com _spf.createsend.com _spf01.mykronos.com _s0.caltech.edu

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

DMARC Record None

v=DMARC1; p=none; fo=1; rua=mailto:6e39dba0@mxtoolbox.dmarc-report.com; ruf=mailto:6e39dba0@forensics.dmarc-report.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 caltech.edu, confirming that this domain cryptographically signs outgoing emails.

Authentication Summary: caltech.edu 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
caltech.edu
TLD
.edu
Created
1986-01-06
Updated
2026-01-30
Expires
2027-07-31
Domain Age
40 years

Registrar

Registrant Contact

Name
California Institute of Technology Information Management Systems and Services MS 1-10
Location
Pasadena, CA, UNITED STATES

Technical Contact

Name
California Institute of Technology
Location
Pasadena, CA, UNITED STATES

Name Servers

  • NS0239.SECONDARY.CLOUDFLARE.COM
  • NS0090.SECONDARY.CLOUDFLARE.COM

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Frequently Asked Questions

Yes, caltech.edu is the official email domain for California Institute of Technology. Educational institution domains are used by students, faculty, and staff.
No, caltech.edu is an educational institution domain belonging to California Institute of Technology. However, student email addresses may be deactivated after graduation.
caltech.edu uses mail infrastructure managed by the institution. Many universities use Microsoft 365 or Google Workspace. Check the MX records above.
Marketing requires opt-in consent. Student addresses may become inactive after graduation. Education domains often have strict spam filtering.
Education domains may use catch-all or restricted SMTP. Student addresses can expire. Use BulkEmailChecker for reliable verification.
The fastest and most accurate way to verify a caltech.edu 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 caltech.edu'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.
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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 caltech.edu addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
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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.
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