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Apple Mail - Attachments

If you are having problems using email to mail with your Apple Mail client, make sure you enable sending of Windows-friendly attachments. 

Instructions from Apple support page:

To do so for all messages, choose Editย > Attachments, then select Always Send Windows-Friendly Attachments. For a specific message, click the Attach button in the toolbar of the new message window, then select Send Windows-Friendly Attachments (if you donโ€™t see the checkbox, click Options in the bottom corner).