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
52.101.8.5	mail-dm2pr02cu00105.inbound.protection.outlook.com	Yes	Not listed
52.101.50.10	mail-mw2pr02cu00502.inbound.protection.outlook.com	Yes	Not listed
52.101.41.26	mail-sj0pr03cu01702.inbound.protection.outlook.com	Yes	Not listed
52.101.41.180	mail-byapr04cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f913::1	mail-cy1pr02cu00101.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::16	mail-ch2pr02cu00206.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f802::2	mail-sj2pr05cu00202.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c936::1	mail-cy4pr03cu00201.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 SJ5PEPF000001D6.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 30 Jul 2026 13:25:45 +0000 [08DEEDBC2888AEDE]`

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

Domains using this mail server

ontic.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.