Yes. You can verify any @Caltech.edu address in real time with a direct SMTP handshake that provides 99.7% accuracy. Caltech.edu is operated by California Institute of Technology, runs 2 mail servers, enforces 3 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.
caltech.edu publishes 2 MX records. The primary mail exchanger is mx2.caltech.iphmx.com, hosted by iphmx.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 | mx2.caltech.iphmx.com | 68.232.137.147 | Reachable |
| 10 | mx1.caltech.iphmx.com | 68.232.147.192 | Reachable |
220 esa.caltech.iphmx.com ESMTPYes. caltech.edu is a valid email domain, operated by California Institute of Technology. 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 Caltech.edu'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.
People leave companies. Verification flags caltech.edu mailboxes deactivated since you collected them.
Expired or full caltech.edu inboxes hard-bounce. A live SMTP check catches them before you hit send.
Low bounce rates keep you trusted by caltech.edu mail servers and the major mailbox providers.
Verified contacts mean your CRM, lead scoring, and routing all run on addresses that reach a person.
Caltech.edu is California Institute of Technology and first seen Jan 6, 1986.
Caltech.edu is California Institute of Technology, classified as education email running on iphmx.com. It operates 2 mail servers and currently accepts SMTP connections.
When verifying caltech.edu addresses, the checker connects directly to iphmx.com over SMTP. With 3 of 3 authentication standards in place and SMTP currently responding, verification results for this domain carry high confidence.
Upload a CSV or TXT list of Caltech.edu 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 Caltech.edu address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
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Everything about verifying email at this domain.
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.
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 caltech.edu's mail servers, the same engine that has verified billions of addresses since 2012.
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