Email server check

Validate an email address step by step: DNS lookup, MX record check, SMTP handshake and PTR verification. Helps confirm whether a mailbox actually exists before sending.

Check Summary

MX Records (Mail Exchange)

A Records (IPv4)

SPF Records (Sender Policy Framework)

DMARC record

SMTP Status (port 25)

PTR Records (Reverse DNS)

What is an email server setup check?

This tool allows you to comprehensively check a domain's email settings. We check for necessary DNS records and the availability of mail servers.

What checks are performed?

MX: Identifies the servers responsible for receiving mail for the domain.
A: Checks the IP addresses of the domain and mail hosts.
SPF: Checks for rules that allow specific servers to send mail on behalf of the domain.
DMARC: Checks the mail handling policy for messages that fail SPF or DKIM checks.
SMTP: Checks the availability of port 25 on mail servers.
PTR: Checks reverse DNS records for the IP addresses of mail servers.

Limitations & notes

We only perform basic SMTP checks for session opening (HELO/EHLO), without sending actual messages.
Some mail servers may block requests from our IP address due to suspicion of scanning.
Absence of SPF or DMARC records does not block delivery, but significantly increases the likelihood of messages ending up in spam.
We do not check the validity of specific mailboxes (RCPT TO), only the general domain settings.

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