For a description of what SMTP is see the following: — For a description of what SMTP is see the following: What Is an SMTP Server? | SendGrid SMTP servers are complicated, and if you're just dipping your toe into the how-email-gets-sent world, it's easy to feel…sendgrid.com A quick run through of an email messages journey: 1. The mail user agent, which is either your email client or an external program. connects to the SMTP server of your domain, e.g. smtp.google.com. This initiates the SMTP handshake. This…