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
52.101.41.122	mail-byapr02cu00302.inbound.protection.outlook.com	Yes	Not listed
40.93.192.1	mail-dm5pr02cu00201.inbound.protection.outlook.com	Yes	Not listed
52.101.60.179	mail-bn3pr0301cu00103.inbound.protection.outlook.com	Yes	Not listed
52.101.50.1	mail-co1pr05cu00401.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c922::7	mail-blapr04cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c936::	mail-cy7pr05cu00100.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c922::2	mail-bl0pr02cu00702.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f910::1	mail-cy3pr04cu00101.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 SJ1PEPF00002312.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 17 Aug 2026 00:02:14 +0000 [08DEF8ADE5DA3B7B]`

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

Domains using this mail server

penguinair.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.