Detect EchoSpoofing and Email Spoofing in Seconds

For email administrators and security analysts: paste raw SMTP logs and instantly surface spoofing red flags like SPF failures, forged HELO names, and unknown senders. Respond to EchoSpoofing-style attacks faster without manual log digging.

Results update live as you type — no button needed. The Example button fills a sample input.

Why use EchoSpoofing Email Spoofing Analyzer?

Instantly parses SMTP/postfix logs to flag spoofing indicators such as SPF fail, unknown senders, and mismatched HELO domains

Highlights EchoSpoofing patterns where attackers exploit email protection to perfectly spoof trusted domains

Extracts key fields: timestamps, client IPs, from/to addresses, HELO names, and rejection reasons

Runs entirely in your browser — no logs are uploaded or stored

Designed for incident response: quickly triage suspicious connections and rejected recipients

FAQ

What is EchoSpoofing?

EchoSpoofing is an attack technique that abuses email protection services to send perfectly spoofed emails from legitimate domains, bypassing traditional authentication checks. This analyzer helps you spot related patterns in SMTP logs.

What log formats are supported?

The analyzer works best with standard SMTP and postfix log lines that include timestamps, hostnames, client IPs, and status messages such as SPF fail or reject reasons.

Are my logs sent to a server?

No. All parsing happens locally in your browser. Your SMTP logs never leave your device.

Can this tool prevent spoofing?

It is a detection and analysis aid. Use its findings to configure SPF, DKIM, DMARC, and firewall rules to reduce spoofing risk.

Example input

Try it with this sample — paste it into the box above:

2025-03-15T10:23:45.123Z mail.example.com postfix/smtpd[12345]: connect from unknown[192.0.2.1]
2025-03-15T10:23:46.456Z mail.example.com postfix/smtpd[12345]: NOQUEUE: reject: RCPT from unknown[192.0.2.1]: 550 5.7.1 <victim@example.com>: Recipient address rejected: SPF fail; from=<spoofed@example.com> to=<victim@example.com> proto=ESMTP helo=<fake.example.com>
2025-03-15T10:23:47.789Z mail.example.com postfix/smtpd[12345]: disconnect from unknown[192.0.2.1] ehlo=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=4/6

How to use EchoSpoofing Email Spoofing Analyzer

  1. Enter or paste your data into the SMTP Logs box above.
  2. The result appears instantly in the Spoofing Analysis box — everything runs in your browser, nothing is uploaded.
  3. Use Copy or Download to keep the result, or Example to load a sample first.

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