Internet Message Headers

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Internet Message Headers by Mind Map: Internet Message Headers

1. Trace information

1.1. Return-Path

1.2. Received

2. Format and control information

2.1. MIME-Version

3. Sender and recipient indication

3.1. From:

3.2. Sender:

3.3. To:

3.4. cc: Carbon Copy

3.5. bcc = Blind Carbon Copy

3.6. Phone: Non-standard

4. Response control

4.1. Reply-To:

5. Message identification and referral headers

5.1. Message-ID

5.2. Content-ID

5.3. In-Reply-To

5.4. References:

6. Other textual headers

6.1. Subject

7. Headers containing dates and times

7.1. Delivery-Date

7.2. Date:

7.3. Expires: Not standardized

8. Quality information

8.1. Priority: influence transmission speed and delivery

8.2. Importance: Values: High, normal, or low.Not used to control transmission speed.

9. Language information

9.1. Language: e.g. "en" for English

10. Encoding information

10.1. Content-Type

11. Resent-headers

11.1. Resent-From:,

11.2. Resent-Date:,

11.3. Resent-To:,

11.4. Resent-cc:,

11.5. Resent-bcc:,

11.6. Resent Message-ID

12. Security and reliability

12.1. Content-MD5: Checksum of the content to ensure that it has not been modified.

13. Miscellaneous

13.1. Status

13.1.1. U message is not downloaded and not deleted

13.1.2. R message is read or downloaded

13.1.3. O message is old but not deleted

13.1.4. D to be deleted

13.1.5. N New

14. Codes utilisés

14.1. Standarisé

14.2. Non Standarisé

14.3. Pas pour l'usage géneral