Internet Direct (Indy) Version 9.0.1 Beta
TIdSMTPServerThread.HELO
Indicates if the client has identified itself in the SMTP session.

HELO: Boolean;
Description
HELO is a public Boolean member that indicates if the SMTP client connection has supplied a HELO or EHLO client identification command, which contains a fully-qualified domain name, to initiate the SMTP session.

HELO is used in the command action handlers for SMTP commands that require a valid session prior to starting a mail transaction, like MAIL, RCPT, and DATA. HELO is updated in the command action handlers CommandHELO and CommandEHLO.