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
52.101.60.176	mail-bn0pr04cu00900.inbound.protection.outlook.com	Yes	Not listed
52.101.50.1	mail-co1pr05cu00401.inbound.protection.outlook.com	Yes	Not listed
52.101.40.28	mail-cy1pr02cu00104.inbound.protection.outlook.com	Yes	Not listed
52.101.8.38	mail-dm3pr04cu00106.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f904::2	mail-ds2pr05cu00102.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f90d::1	mail-sn1pr0501cu00301.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f803::1	mail-byapr05cu00601.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f907::	mail-dm2pr02cu00100.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 SN1PEPF0002BA4B.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Wed, 19 Aug 2026 08:09:38 +0000 [08DEF8F04E7208C9]`

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

Domains using this mail server

sunmechanical.net

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.