Yes. You can verify any @Mountsinai.org address in real time with a direct SMTP handshake that provides 99.7% accuracy. Mountsinai.org is operated by Mount Sinai Health System, runs 10 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.
mountsinai.org publishes 10 MX records. The primary mail exchanger is smtp-agent02.mountsinai.org, hosted by mountsinai.org, 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 | smtp-agent02.mountsinai.org | 146.203.148.112 | Reachable |
| 10 | smtp-agent03.mountsinai.org | 146.203.148.113 | Reachable |
| 10 | smtp-agent05.mountsinai.org | 146.203.148.115 | Reachable |
| 10 | smtp-agent06.mountsinai.org | 146.203.148.116 | Reachable |
| 10 | smtp-agent01.mountsinai.org | 146.203.148.111 | Reachable |
| 10 | smtp-agent04.mountsinai.org | 146.203.148.114 | Reachable |
| 20 | smtp-agent14.mountsinai.org | 159.123.236.114 | Reachable |
| 20 | smtp-agent11.mountsinai.org | 159.123.236.111 | Reachable |
| 20 | smtp-agent12.mountsinai.org | 159.123.236.112 | Reachable |
| 20 | smtp-agent13.mountsinai.org | 159.123.236.113 | Reachable |
220 smtp-agent02.mountsinai.org ESMTP Mon, 1 Jun 2026 17:10:34 -0400Yes. mountsinai.org is a valid email domain, operated by Mount Sinai Health System. 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 Mountsinai.org'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 mountsinai.org mailboxes deactivated since you collected them.
Expired or full mountsinai.org inboxes hard-bounce. A live SMTP check catches them before you hit send.
Low bounce rates keep you trusted by mountsinai.org mail servers and the major mailbox providers.
Verified contacts mean your CRM, lead scoring, and routing all run on addresses that reach a person.
Mountsinai.org is Mount Sinai Health System, registered through Network Solutions, LLC and first seen Feb 23, 1996.
Mountsinai.org is Mount Sinai Health System, classified as corporate email running on mountsinai.org. It operates 10 mail servers and currently accepts SMTP connections.
When verifying mountsinai.org addresses, the checker connects directly to mountsinai.org 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 Mountsinai.org 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 Mountsinai.org 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, mountsinai.org is the official corporate email domain for Mount Sinai Health System. It is used for internal business communications and is not available for public registration.
No, mountsinai.org is a corporate email domain belonging to Mount Sinai Health System, used exclusively by employees and authorized personnel.
mountsinai.org uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
B2B marketing to mountsinai.org requires proper consent. Corporate domains may use catch-all configurations, so verify individual addresses before sending.
Corporate domains like mountsinai.org may use catch-all configurations. Use BulkEmailChecker's advanced verification to detect catch-all behavior.
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 mountsinai.org's mail servers, the same engine that has verified billions of addresses since 2012.
Other corporate email domains we have audited.