Read email headers

Email headers are the lines of text at the top of an email message that contain information about the email, such as the sender, recipient, date, time, and other details. Here's a breakdown of the different parts of an email header:

From: The sender's email address.

To: The recipient's email address.

Subject: The subject line of the email.

Date: The date and time the email was sent.

Message-ID: A unique identifier assigned to the email by the email server.

In-Reply-To: The message ID of the email that this email is a reply to.

References: A list of message IDs of emails that this email is a reply to.

X-Mailer: The email client or program used to send the email.

X-Priority: The priority level of the email, such as "High" or "Low".

X-Sender: The sender's email address, often used by email servers to identify the sender.

X-Originating-IP: The IP address of the computer that sent the email.

Authentication-Results: Information about the authentication status of the email, such as whether it was sent from a trusted sender.

DKIM-Signature: A digital signature that verifies the authenticity of the email.

SPF-Pass: Information about the sender's domain and whether it is authorized to send emails.

Here's an example of an email header:

From: John Doe <[email protected]>
To: Jane Smith <[email protected]>
Subject: Test Email
Date: Wed, 12 Jan 2022 14:30:00 +0000
Message-ID: <[email protected]>
In-Reply-To: <[email protected]>
References: <[email protected]>
X-Mailer: Mozilla Thunderbird 78.10.0
X-Priority: 3 (Normal)
X-Sender: [email protected]
X-Originating-IP: [192.0.2.1]
Authentication-Results: spf=pass (sender IP is 192.0.2.1) [email protected]
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=example; h=from:to:subject:date:message-id; bh=1234567890; b=1234567890
SPF-Pass: pass (sender IP is 192.0.2.1) [email protected]

Note that not all email headers are shown in this example, and the actual headers may vary depending on the email client and server used.