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
52.101.41.180	mail-byapr04cu00204.inbound.protection.outlook.com	Yes	Not listed
52.101.9.24	mail-bl2pr02cu00400.inbound.protection.outlook.com	Yes	Not listed
52.101.42.165	mail-co2pr03cu00305.inbound.protection.outlook.com	Yes	Not listed
52.101.194.164	mail-ch5pr04cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c95d::8	mail-ph8pr21cu00200.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c927::	mail-bn6pr21cu00500.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::5	mail-bn0pr04cu00805.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::1	mail-bn0pr02cu00301.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 MWH0EPF000A672F.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 15 Oct 2026 02:18:10 +0000 [08DF26DA66858520]`

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

Domains using this mail server

circuitboards.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.