title: Sending email to same/different domains
body: <p>I am doing a Networks course and as I was reading about SMTP I thought about the following matter:</p>
  
  <p>If a user sends an email to user1@example.com, user2@example.com, user3@example.com, does it take the same amount of time to send the emails separately as it does to send it as a multi-recipient email?</p>
  
  <p>Or when the first one is sent, the next two are easier to send since the connection is already established with that server? Or does the connection close immediately thus making no difference?</p>
  
  <p>What about when the emails belong to different domains?</p>