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
52.101.9.11	mail-bl1pr02cu00103.inbound.protection.outlook.com	Yes	Not listed
52.101.60.163	mail-bn3pr04cu00103.inbound.protection.outlook.com	Yes	Not listed
52.101.41.206	mail-byapr05cu00806.inbound.protection.outlook.com	Yes	Not listed
52.101.11.13	mail-sn1pr0501cu00205.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c91d::	mail-mw2pr04cu00100.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c922::2	mail-bl0pr02cu00702.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c927::8	mail-bn3pr0301cu00200.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f805::2	mail-co2pr03cu00202.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 BL6PEPF00022574.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 17 Aug 2026 17:00:58 +0000 [08DEF8AD5B57EEA2]`

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

Domains using this mail server

sielox.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.