Hello Reinhard,
thanks for providing a sample EML file. The converted mail has an attachement with point characters in it (i. e. "Einladung_zum_Notes_AK_am_07.10.2005.pdf"). For a MIME compatible conversion this attachement name has been converted into an ISO-8559-1 format (=?ISO-8859-1?Q?Einladung_zum_Notes_AK_am_07=2E10=2E2005=2EPDF?=). You can see this when you open an EML file with a text editor,
I'll fix it in the upcoming release (re-converting the file-name).
Thanks for reporting!
– RenĂ©