checkeremail.com

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
52.101.187.1	mail-gvap278cu00301.inbound.protection.outlook.com	Yes	Not listed
52.101.185.13	mail-zrzp278cu00205.inbound.protection.outlook.com	Yes	Not listed
52.101.185.12	mail-zrap278cu00304.inbound.protection.outlook.com	Yes	Not listed
52.101.185.14	mail-zr1p278cu00206.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca3c::2	mail-zr1p278cu00202.inbound.protection.outlook.com	No	Not listed
2a01:111:f403:ca3c::1	mail-zrzp278cu00201.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca3c::	mail-zrap278cu00300.inbound.protection.outlook.com	Yes	Not listed
2a01:111:f403:ca3e::1	mail-gvap278cu00301.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 ZR2PEPF0000012C.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Sun, 2 Aug 2026 08:35:29 +0000 [08DEEDC4C0B2CFCD]`

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

Domains using this mail server

wittenbach.ch

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.