SMTP Submission (Port 587): What It Is and Why It’s Different

SMTP submission is the recommended way clients send email via a server. Learn the difference between submission and relay.

SMTP submission is the process of clients sending outgoing email to a submission server, usually on port 587 with authentication. It’s designed for user-to-server sending.

This differs from server-to-server SMTP relay, which transfers mail between MTAs. Using submission correctly improves security and reduces misrouting or authentication confusion.

SMTP AUTH: What It Is and When It’s Used

STARTTLS: Upgrading SMTP Connections to Encryption

It just works like magic.

SMTP Submission (Port 587): What It Is and Why It’s Different

It just works like magic.