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
52.101.68.21	mail-db4pr02cu00205.inbound.protection.outlook.com	Yes	Not listed
52.101.73.155	mail-am7pr02cu00203.inbound.protection.outlook.com	Yes	Not listed
52.101.91.162	mail-matpr04cu00302.inbound.protection.outlook.com	Yes	Not listed
52.101.185.114	mail-zrxpr04cu00102.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca3c::6	mail-zrxpr04cu00106.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca09::24	mail-am6pr02cu00204.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca21::a	mail-maspr04cu00102.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca48::10	mail-miypr05cu00100.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 AM3PEPF0000A795.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Thu, 3 Sep 2026 08:57:09 +0000 [08DF09442AD8CBCA]`

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

Domains using this mail server

upsignon.eu

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.