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
40.93.192.4	mail-dm2pr04cu00404.inbound.protection.outlook.com	Yes	Not listed
52.101.11.17	mail-sn1pr0501cu00301.inbound.protection.outlook.com	Yes	Not listed
52.101.42.162	mail-ea3pr05cu00102.inbound.protection.outlook.com	Yes	Not listed
52.101.41.22	mail-sj2pr05cu00406.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::1	mail-bn0pr02cu00301.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f912::	mail-cy7pr21cu00100.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:c946::3	mail-ch0pr04cu00603.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:f804::7	No	Unknown	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 SJ5PEPF000001EC.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Tue, 3 Nov 2026 16:34:04 +0000 [08DF36F6FD0CA388]`

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

Domains using this mail server

dannemann.com.br

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.