ns.checkeremail.com

ns.checkeremail.com is a mail server (MX) used by 1 checked domain. Based on public DNS, it looks healthy.

IP & reverse DNS

IP address	Reverse DNS (PTR)	FCrDNS	DNSBL
52.101.50.1	mail-co1pr05cu00401.inbound.protection.outlook.com	Yes	Not listed
52.101.202.150	mail-ph6pr04cu00106.inbound.protection.outlook.com	Yes	Not listed
52.101.41.21	mail-sj2pr05cu00305.inbound.protection.outlook.com	Yes	Not listed
52.101.60.188	mail-bn0pr04cu01004.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::1	mail-ch1pr04cu00101.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f903::3	mail-mn0pr04cu00203.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::10	mail-ch4pr04cu00300.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f904::d	mail-dm2pr03cu00105.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.

Server software

Detected software	Microsoft Exchange / 365 (from SMTP banner)
SMTP banner	`220 SJ1PEPF000026C3.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 10 Aug 2026 13:34:24 +0000 [08DEF340012A1D6E]`

Captured passively during an earlier check — we do not actively scan mail servers.

Domains using this mail server

dc.com

What does this mean?

These are public DNS facts about the mail server ns.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.