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
52.101.137.0	mail-sg2pr03cu00500.inbound.protection.outlook.com	Yes	Not listed
52.101.157.80	mail-os8pr02cu00100.inbound.protection.outlook.com	Yes	Not listed
52.101.124.117	mail-tydpr03cu00105.inbound.protection.outlook.com	Yes	Not listed
52.101.137.2	No	Unknown	Not listed
2a01:111:f403:cc1f::4	mail-os8pr02cu00104.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:cc09::	mail-sg2pr03cu00500.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:cc1a::8	mail-tydpr03cu00100.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:cc09::1	No	Unknown	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 TY2PEPF0000AB89.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Wed, 22 Jul 2026 04:30:28 +0000 [08DEE7385AD2F616]`

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

Domains using this mail server

s2t.ai

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.