उत्तर : 2. "प्रेषक मेल आईडी (Sender Mail ID)"
व्याख्या :

1. To send an email, the sender's email address is mandatory. An email address is a unique identifier that connects an email message to a specific user.

2. Other required information for sending the email includes-

- Recipient's Email Address

- The subject of the email

- Email Message