ns.checkeremail.com

ns.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
23.103.199.138	mail-bn3usg020138.inbound.protection.outlook.com	Yes	Not listed
23.103.199.170	mail-cy1usg020170.inbound.protection.outlook.com	Yes	Not listed
2001:489a:2202:4::10	mail-bn3usg020010.inbound.protection.outlook.com	No	Not listed
2001:489a:2202:5::10	mail-cy1usg020010.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 CY1USG02FT005.mail.protection.office365.us Microsoft ESMTP MAIL Service ready at Tue, 3 Nov 2026 09:32:55 +0000 [08DF390B00CF03D0]`

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

Domains using this mail server

fariabeede.com

What does this mean?

These are public DNS facts about the mail server ns.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.