checkeremail.com

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
52.101.41.54	mail-sj2pr05cu00506.inbound.protection.outlook.com	Yes	Not listed
52.101.41.183	mail-byapr04cu00307.inbound.protection.outlook.com	Yes	Not listed
52.101.41.26	mail-sj0pr03cu01702.inbound.protection.outlook.com	Yes	Not listed
52.101.60.68	mail-bnypr02cu00104.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c936::1	mail-cy4pr03cu00201.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c92c::7	mail-dm3pr04cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f912::	mail-cy7pr21cu00100.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::4	mail-ch0pr04cu00504.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 BN3PEPF0000B06F.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Tue, 15 Sep 2026 04:10:07 +0000 [08DF0A3F46FA8572]`

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

Domains using this mail server

concord-academy.org

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.