checkeremail.com is a mail server (MX) used by 1 checked domain. Based on public DNS, it looks healthy.
| IP address | Reverse DNS (PTR) | FCrDNS | DNSBL |
|---|---|---|---|
| 52.101.41.56 | mail-sj0pr21cu00100.inbound.protection.outlook.com | Yes | Not listed |
| 52.101.41.24 | mail-sj0pr03cu01600.inbound.protection.outlook.com | Yes | Not listed |
| 40.93.192.1 | mail-dm5pr02cu00201.inbound.protection.outlook.com | Yes | Not listed |
| 52.101.50.7 | mail-co1pr21cu00207.inbound.protection.outlook.com | Yes | Not listed |
| 2a01:111:f403:f909:: | mail-bn6pr04cu00200.inbound.protection.outlook.com | Yes | Not listed |
| 2a01:111:f403:f908::1 | mail-bn1pr04cu00101.inbound.protection.outlook.com | Yes | Not listed |
| 2a01:111:f403:c918::3 | mail-byapr03cu00203.inbound.protection.outlook.com | Yes | Not listed |
| 2a01:111:f403:f805::3 | mail-ea3pr05cu00103.inbound.protection.outlook.com | Yes | Not listed |
FCrDNS (forward-confirmed reverse DNS) passes when the IP’s PTR name resolves back to the same IP. It is a key signal that a mail server is legitimately configured; servers without it are widely treated as suspicious.
| Detected software | Microsoft Exchange / 365 (from SMTP banner) |
|---|---|
| SMTP banner | 220 SJ1PEPF00001CE2.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 27 Aug 2026 17:50:17 +0000 [08DF043E24B0BC74] |
Captured passively during an earlier check — we do not actively scan mail servers.
These are public DNS facts about the mail server checkeremail.com — the host that other servers connect to when delivering email for the domains above. We do not actively probe it over SMTP; the checks here are reverse DNS, forward-confirmed rDNS and public blocklists.
To look up a specific domain’s mail setup use the MX Lookup, or verify an address with the email checker. Learn more in email servers explained.
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