How gmail send mail

Here's a high-level overview of how Gmail sends an email:

Step 1: User Composes Email

  1. A user composes an email using the Gmail web interface, mobile app, or desktop client.
  2. The user enters the recipient's email address, subject, and message body.
  3. The user clicks the "Send" button.

Step 2: Email Processing

  1. Gmail's servers receive the email composition request and process it.
  2. Gmail's servers perform various checks, such as:
    • Validating the recipient's email address.
    • Checking the user's account settings (e.g., spam filters, forwarding rules).
    • Encrypting the email (if necessary).
  3. Gmail's servers store the email in a temporary queue.

Step 3: Email Routing

  1. Gmail's servers use a routing algorithm to determine the best path to send the email.
  2. The algorithm takes into account factors such as:
    • The recipient's location.
    • The sender's location.
    • Network congestion.
    • Email server availability.
  3. Gmail's servers select a suitable email server to send the email to.

Step 4: Email Transmission

  1. Gmail's servers transmit the email to the selected email server using a protocol such as SMTP (Simple Mail Transfer Protocol).
  2. The email server receives the email and stores it in its queue.
  3. The email server attempts to deliver the email to the recipient's email server.

Step 5: Email Delivery

  1. The recipient's email server receives the email and stores it in its queue.
  2. The email server attempts to deliver the email to the recipient's email client (e.g., Gmail, Outlook, Yahoo).
  3. The recipient's email client receives the email and displays it in their inbox.

Step 6: Email Storage

  1. The recipient's email client stores the email in their email account.
  2. The email is stored on the recipient's email server or in the cloud (e.g., Gmail's servers).

Additional Steps

  1. Gmail's servers may perform additional checks, such as:
    • Spam filtering.
    • Virus scanning.
    • Content filtering.
  2. Gmail's servers may also store a copy of the email in their own servers for backup and archiving purposes.

This is a simplified overview of the process. Gmail's actual implementation may involve additional steps, protocols, and technologies to ensure reliable and secure email delivery.