Hallo,
ich denke das geht gar nicht, denn:

Using the Send Distribution ( SNDDST *DOC ) command to send a document to a user ID and address that will route it through the QSMTPQ distribution queue is not supported. Message CPI9046 with RC0401 (invalid document) results.

The QSMTPQ uses the previous Bridge Client to send simple SMTP messages. It does not support MIME and sends only FFT-type documents. This is a permanent restriction for SNDDST .