Check the mail server framework jobs (QMSF jobs in the QSYSWRK system)

You should check mail server framework jobs to determine a possible cause of the error in the QtmmSendMail API.

1. If the MSF stopped processing the message, check the MSF jobs for error messages.
2. If the framework job completed, the MIME file should be deleted. This means that the framework processed the MIME file. Your problem is not with the API, but in your SMTP configuration.