HELO command: Identify the domain name of the sending host to SMTP

Purpose

Use the HELO command to identify the domain name of the sending host to SMTP before you issue a MAIL FROM command.

Format

Read syntax diagramSkip visual syntax diagramHELOdomain_name

Parameters

domain_name
Specifies the domain name of the sending host.

Usage

  • The HELO command is sent once before a MAIL FROM command.