Print warning when unsupported attachs are found
* po/POTFILES.in: Add mimemaker. * src/mimemaker.cpp (count_usable_attachments): Also count OLE and embedded. (write_attachments): Print warning in case such an attach was found. (add_body_and_attachments): Forward error.
This should only show when we previously would have
ignored an attachment. Siliently ignoring attachments
like appointments can lead to ugly communication.
- GnuPG-Bug-Id: T4184