attachment problems mac mail 10.3
Hello.. recently updated to OSX Sierra wth mac mail 10.3.. No problems in previous versions of Mail, but now attached jpegs appear as small icons with question marks.. both to recipients and when I check the email in 'sent' folder. I need to stay with Sierra so can't update to later version of Mail which appears to have cured the problem?
The jpegs actually appear OK when composing the email.. but as soon as sent.. what happens?
( I can attach and send pdf's without any problems..)
Mac Pro, macOS 10.12