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
52.101.41.3	mail-sj2pr05cu00103.inbound.protection.outlook.com	Yes	Not listed
52.101.60.188	mail-bn0pr04cu01004.inbound.protection.outlook.com	Yes	Not listed
52.101.9.84	mail-mn0pr04cu00204.inbound.protection.outlook.com	Yes	Not listed
52.101.42.87	mail-co2pr03cu00207.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c92c::7	mail-dm3pr04cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c922::4	mail-bl1pr02cu00104.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::2	mail-ch4pr04cu00102.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f801::	mail-byapr05cu00700.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 BN2PEPF00004FBE.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Fri, 4 Sep 2026 10:04:34 +0000 [08DF0485072ABE26]`

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

Domains using this mail server

startribune.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.