Mail poller with signed mails


We have configured email pollers and have issues with getting signed mail:
No content handler for content type multipart/signed. Service (…) called without content handler.

As the effect service is called but does not contain any content. We checked mail manually on server and it contained appropiate message (body).

Is there any way to get message body when mail is “multipart/signed”?

wM v 9.7