Answer (1 of 4): in macOS Sierra: Mail>Preferences>Accounts> (Select Account) Account Information>Download Attachments>None 1. Click on the OK button. 3. Agreed.I'm not sure my answer is really the "Correct Answer" - more of a workaround (that you need to pay for!).Please send your feedback to Apple... If you have a signature created in Outlook, go to mail options and click Signatures… while holding the Ctrl key: A window with your defined signatures will open. How to Control Your Attachments in Mail yes - that is how it worked pre lion. but now that is not working in Lion. Send a test to someone on a PC. The fix is to resend the PC’s outlook email attachment, but first delete the recipients autofilled email address. To edit the one you want, right-click it and choose a simple text editor like notepad. There are two basic approaches to attaching images to email messages: enclosing and embedding. OS X: Turning Off Inline Mail Attachments - The Mac Observer setup an iPhone to always send in HTML Double click on the email address. How to download, open, and save e-mail attachments