Internet Direct (Indy) Version 9.0.1 Beta
TIdSMTP.MailAgent
Identifies the program that created a message.

property MailAgent: string;
Description
MailAgent is a String property that identifies the name of a program used to create or transmit a message. MailAgent specifies your program name, and is placed in the SMTP "X-Mailer" header in the Send method.