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
52.101.10.16	mail-bn6pr21cu00500.inbound.protection.outlook.com	Yes	Not listed
52.101.41.21	mail-sj2pr05cu00305.inbound.protection.outlook.com	Yes	Not listed
52.101.41.198	mail-byapr05cu00706.inbound.protection.outlook.com	Yes	Not listed
52.101.60.191	mail-bn0pr05cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f907::1	mail-dm1pr04cu00201.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f90f::1	mail-sa9pr04cu00201.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c946::7	mail-ch5pr02cu00307.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f804::7	mail-co2pr03cu00307.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 SJ5PEPF000001D6.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 30 Jul 2026 13:25:45 +0000 [08DEEDBC2888AEDE]`

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

Domains using this mail server

ontic.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.