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
52.101.9.87	mail-bl2pr02cu00507.inbound.protection.outlook.com	Yes	Not listed
52.101.42.87	mail-co2pr03cu00207.inbound.protection.outlook.com	Yes	Not listed
52.101.9.93	mail-blapr04cu00105.inbound.protection.outlook.com	Yes	Not listed
52.101.41.56	mail-sj0pr21cu00100.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::3	mail-bnypr03cu00103.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f804::3	mail-co1pr03cu00403.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:f909::b	mail-bnypr03cu00203.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:c902::6	mail-sj0pr21cu00106.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 BY1PEPF0001AE18.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Fri, 24 Jul 2026 07:23:17 +0000 [08DEE833672C7C44]`

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

Domains using this mail server

apellis.com

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.