PC/Outlook recipients complain about Mac Mail attaching blank untitledattachment*.htm files to emails
How do I prevent Outlook users receiving "untitledattachment*.htm" files when I send from Mac Mail? It seems to attach one blank untitledattachment*.htm file per attachment, whether I'm sending an attachment or if I'm forwarding an email that may have had attachments (jpegs in email signatures, not belonging to me). I have set my preferences to send windows-friendly attachments and to insert attachments at the end of the email. I can't find a recent discussion on this.
MacBook Pro 13", macOS 10.13