Used to set the text of the messages subject.
You would normally call this function to set a Subject but it is not mandatory.
No Subject is defined immediately following a MAIL_START call.
Details of the email definition will be lost unless the MAIL_SEND Built-In Function is used to send the message.
If any error occurs, all details of the email definition will be lost. To restart processing, a new call to MAIL_START would be required.
This example shows only this function. See the example for MAIL_START which defines all details of an Email message and then sends it by using Built-In Functions.
********** COMMENT(Set Subject text)
USE BUILTIN(MAIL_SET_SUBJECT) WITH_ARGS('Testing Email Built-In Functions') TO_GET(#LEM_RETC)