Email header analyzer
a message〜see who sent it Email header analyzer: paste the full headers、the servers it passed through, delays between hops、the authentication 結果.
your browser. NothingのAnalysis happensはOutlook open the message properties.のuploaded. In Gmail choose “Show original”,です
Email header analyzerについて
a message〜see who sent it Email header analyzer: paste the full headers、the servers it passed through, delays between hops、the authentication 結果.
SmartCalcyの「データとネットワーク」セクションの一部です。アカウント不要でブラウザ上で動作し、お使いの通貨と単位（ページ上部で変更可）を使います。結果は参考用の目安なので、頼る前に公的な情報をご確認ください。
Email header analyzerの使い方
何を計算するか、いつ使うか
an email Reads the full headersとshows the route it took、the delay 適用 1個あたり server,、the SPF、DKIM、your browser.のspoofing, such as a sending domain that differs from the From address. Everything happens DMARC results. It also flags signs
使い方の手順
- Outlook open the message properties.のGmail choose “Show original”,のOpen the email’s raw headers:
- コピー everything above the メッセージ bodyとpaste it into the 箱.
- Read the authentication 結果とthe route, oldest hop first.
- Check the warnings個でdomain mismatches.
各入力項目の意味
- Email headers – The complete header block、starting with 行 such as Received:、開始:.
結果の読み方
- Authentication – SPF、DKIM、DMARC 結果 taken 開始 the receiving server’s Authentication-Results header.
- メッセージ 詳細 – 開始、終了, 日付, Message-ID, Return-Path, Reply-To、mailer.
- Route – 1個あたり server hop、its address、the 時刻 added between hops.
- Warnings – Domain mismatchesとfailed checks.
計算式
Received headers are added at the top by each server, so they are read bottom〜top. The delay at a hopはits timestamp minus the previous hop’s. Total delivery timeはthe last timestamp minus the first.ですです
計算例
A メッセージ with spf=pass、dkim=pass、5 seconds across 2 hops, shows no warnings.のdmarc=pass sent from the same domain as its From address, delivered
前提と限界
- The receiving server’s Authentication-Results headerはtrusted. Earlier Received 行 缶 be forged by a sender.です
- 時刻 stamps use 1個あたり server’s own clock, so small negative delays 缶 appear.
- なしはuploaded.です
よくある間違い
- the headers. Pasting only part
- Trusting the From name. Itはeasy〜fakeです、so check the domain、authentication 結果.
- fraud. Forwarded mail often fails SPF. Treating a failed SPF as proof
よくある質問
Gmail?のHow 操作 I 求めるもの the headers
Open the メッセージ、choose the three-dot menu, then “表示内容 元のテキスト”,、コピー the header text.
What 操作 SPF、DKIM、DMARC 平均?
SPF checks the sending server. DKIM checks a signature on the メッセージ. DMARC says what〜操作 when they 操作 not match the 開始 domain.
缶 headers be faked?
行 added by the sender 缶、but the topmost Received 行、Authentication-Results 開始 your own provider are reliable.
Is my email uploaded?
your browser.のいいえ. The headers are analysed