checkeremail.com

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
52.101.42.18	mail-co1pr03cu00302.inbound.protection.outlook.com	Yes	Not listed
52.101.41.21	mail-sj2pr05cu00305.inbound.protection.outlook.com	Yes	Not listed
52.101.10.14	mail-bn6pr04cu00206.inbound.protection.outlook.com	Yes	Not listed
52.101.40.53	mail-cy3pr05cu00205.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::14	mail-ch3pr04cu00104.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:c902::14	mail-byapr04cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f908::	mail-bn1pr21cu00100.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:c927::7	mail-bn0pr04cu00907.inbound.protection.outlook.com	No	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 BN3PEPF00022BD1.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Fri, 18 Sep 2026 14:52:41 +0000 [08DF14663AF1085E]`

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

Domains using this mail server

rumolog.com

What does this mean?

These are public DNS facts about the mail server 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.