checkeremail.com

checkeremail.com is a mail server (MX) used by 1 checked domain. Based on public DNS, it is partially configured.

IP & reverse DNS

IP address	Reverse DNS (PTR)	FCrDNS	DNSBL
52.101.41.54	mail-sj2pr05cu00506.inbound.protection.outlook.com	Yes	Not listed
52.101.41.26	mail-sj0pr03cu01702.inbound.protection.outlook.com	Yes	Not listed
52.101.9.20	mail-bl0pr02cu00604.inbound.protection.outlook.com	Yes	Not listed
52.101.41.58	mail-sj0pr02cu00102.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f804::1	mail-co1pr05cu00301.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f805::1	mail-co1pr03cu00301.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f901::2	mail-bl2pr02cu00402.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::b	mail-bnypr03cu00203.inbound.protection.outlook.com	No	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 LV8PEPF0000005E.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 20 Aug 2026 21:07:00 +0000 [08DEFEF799568426]`

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

Domains using this mail server

acestainless.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.