Turn Raw Email Guard Logs Into a Clear Security Report

For email administrators and security engineers who need to inspect SMTP gateway logs fast. Paste your mail gateway log and instantly see which senders were blocked, which messages were delivered, and why — no scripts, no setup, no data leaves your browser.

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

Why use Email Guard MCP Converter?

Instantly parses Postfix, Sendmail, and generic SMTP gateway log lines

Highlights blocked senders, DNSBL rejections, and delivery outcomes

Groups results by sender, recipient, queue ID, and status

Explains rejection codes like 554 5.7.1 in plain language

Runs fully client-side — your logs never leave your browser

FAQ

What log formats are supported?

The analyzer works with common SMTP gateway logs, including Postfix, Sendmail, and Exim-style lines that contain connect, reject, client, from, to, status, and relay fields.

Does it store or send my logs anywhere?

No. All parsing happens locally in your browser. Your log data is never uploaded, stored, or shared.

Can it tell me why a message was blocked?

Yes. It extracts rejection codes and DNSBL references, such as 554 5.7.1 blocked using dnsbl.example.net, so you can see the exact reason a sender was denied.

Is this a replacement for my email security gateway?

No. It is a diagnostic converter that helps you read and summarize gateway logs faster. It does not filter, block, or deliver email.

Example input

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

2024-05-12T09:14:22Z mail-gw01 postfix/smtpd[2841]: connect from unknown[203.0.113.45]
2024-05-12T09:14:23Z mail-gw01 postfix/smtpd[2841]: NOQUEUE: reject: RCPT from unknown[203.0.113.45]: 554 5.7.1 Service unavailable; Client host [203.0.113.45] blocked using dnsbl.example.net; from=<spammer@bad-domain.test> to=<alice@example.com> proto=ESMTP helo=<bad-domain.test>
2024-05-12T09:15:01Z mail-gw01 postfix/smtpd[2842]: connect from mail.corp.example[198.51.100.20]
2024-05-12T09:15:02Z mail-gw01 postfix/smtpd[2842]: 3F1A2B3C4D: client=mail.corp.example[198.51.100.20]
2024-05-12T09:15:03Z mail-gw01 postfix/cleanup[2843]: 3F1A2B3C4D: message-id=<20240512091503.3F1A2B3C4D@example.com>
2024-05-12T09:15:04Z mail-gw01 postfix/qmgr[2844]: 3F1A2B3C4D: from=<bob@corp.example>, size=4821, nrcpt=1 (queue active)
2024-05-12T09:15:05Z mail-gw01 postfix/smtp[2845]: 3F1A2B3C4D: to=<alice@example.com>, relay=mx.example.com[192.0.2.10]:25, delay=3.1, status=sent (250 2.0.0 Ok: queued as 9Z8Y7X6W)

How to use Email Guard MCP Converter

  1. Enter or paste your data into the Paste SMTP / Email Guard Log box above.
  2. The result appears instantly in the Structured Security & Delivery Report 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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