The API that sends e-mail from iSeries requires you to write the sender's e-mail address. Using this API, anyone can send mail using another's address. Is there any log on the iSeries that shows who sent the e-mail?
To determine who used a particular API or file or user profile or any object on OS/400, you can turn on auditing for that particular object. Use the Change Object Audit (CHGOBJAUD), command and specify that you want to log all accesses of this particular API. When the API is called, the audit entry will list the job as well as the user calling the program.
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