Cid mail

You're referring to CID (Client ID) mail!

CID mail, also known as "CID" or "Content-ID" mail, is a type of email that allows you to embed images, audio, or video files directly into the email body. This is different from traditional email attachments, where the file is sent as a separate attachment that the recipient needs to download and open.

Here's how it works:

1. The sender creates an email with a unique identifier (CID) for each embedded file.
2. The email client (e.g., Outlook, Gmail) sends the email to the recipient's email server.
3. The recipient's email client receives the email and requests the embedded files from the sender's email server using the CID.
4. The sender's email server sends the embedded files to the recipient's email client, which then displays them within the email body.

CID mail has several benefits, including:

• Reduced email size: Since the files are embedded directly into the email body, the overall email size is smaller, making it easier to send and receive.
• Improved user experience: Recipients can view the embedded files without having to download and open attachments.
• Better security: CID mail can help prevent malware and viruses from being spread through email attachments.

However, CID mail also has some limitations and potential issues, such as:

• Compatibility issues: Not all email clients support CID mail, which can lead to compatibility problems.
• File size limitations: Some email clients may have limitations on the size of files that can be embedded using CID mail.
• Security risks: CID mail can potentially be used to spread malware or viruses if not implemented securely.

Overall, CID mail is a useful feature for sending multimedia content via email, but it's essential to ensure that it's implemented securely and is compatible with the recipient's email client.