ns.checkeremail.com

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

IP & reverse DNS

IP address	Reverse DNS (PTR)	FCrDNS	DNSBL
52.101.202.156	mail-ph8pr21cu00204.inbound.protection.outlook.com	Yes	Not listed
52.101.60.65	mail-bn3pr02cu00101.inbound.protection.outlook.com	Yes	Not listed
52.101.194.155	mail-chtpr21cu00103.inbound.protection.outlook.com	Yes	Not listed
52.101.60.191	mail-bn0pr05cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c902::14	mail-byapr04cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c918::5	mail-byapr05cu00805.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f90b::2	mail-bnypr02cu00102.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:f801::	mail-byapr05cu00700.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 BN2PEPF000055DC.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 14 Sep 2026 18:00:28 +0000 [08DF0E37E938C893]`

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

Domains using this mail server

engage.mail.microsoft

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.