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
52.101.185.21	mail-zrxpr05cu00105.inbound.protection.outlook.com	Yes	Not listed
52.101.185.24	mail-zrxpr07cu00100.inbound.protection.outlook.com	Yes	Not listed
52.101.91.153	mail-matpr04cu00101.inbound.protection.outlook.com	Yes	Not listed
52.101.91.159	mail-matpr04cu00207.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca21::a	mail-maspr04cu00102.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:ca04::9	mail-db7pr03cu00601.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:c967::c	mail-cpjpr05cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca21::e	mail-matpr04cu00306.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 DB1PEPF000509F6.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Sat, 1 Aug 2026 13:36:20 +0000 [08DEEDA9E83F6FE7]`

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

Domains using this mail server

maxongroup.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.