Mac Mail
Hi... a curious issue - over the last week or so, attachments are not coming through with emails from a non-Apple user [who happens to be my biggest customer :-(]. True for Word and PDF attachments - instead there is only a tiny 'winmail.dat' icon ..... Attachments ok from other correspondents. Any ideas, because I am at a total loss. Issue encountered from this person on both my MacbookPro and iPhone....
MacBook Pro 13″, macOS 11.6