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
52.101.42.84	mail-co1pr02cu00204.inbound.protection.outlook.com	Yes	Not listed
52.101.60.148	mail-bnypr04cu00104.inbound.protection.outlook.com	Yes	Not listed
52.101.10.8	mail-bn1pr04cu00100.inbound.protection.outlook.com	Yes	Not listed
52.101.194.167	mail-ch0pr02cu00107.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f90d::1	mail-sn1pr0501cu00301.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c902::4	mail-sj0pr03cu01504.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::b	mail-bnypr03cu00203.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f904::2	mail-ds2pr05cu00102.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 CO1PEPF00012E7E.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Wed, 30 Sep 2026 15:14:31 +0000 [08DF1C6408D9C3C0]`

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

Domains using this mail server

activafac.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.