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
52.101.198.1	mail-cp4p284cu00401.inbound.protection.outlook.com	Yes	Not listed
52.101.198.38	mail-cp3p284cu00706.inbound.protection.outlook.com	Yes	Not listed
52.101.200.0	mail-roap284cu02600.inbound.protection.outlook.com	Yes	Not listed
52.101.198.0	mail-cp5p284cu01800.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c94a::1	mail-cp4p284cu00401.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c94c::	mail-roap284cu02600.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c94a::2	mail-cp3p284cu00702.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c94a::	mail-cp5p284cu01800.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 RI1PEPF000008D9.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Mon, 19 Oct 2026 11:14:34 +0000 [08DF25473B7150A3]`

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

Domains using this mail server

nstech.com.br

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.