MAC Tip…. when sending images MAC messages always import them inline, this makes a image unusable if its a PNG with transparent background. Follow these quick steps to help your designer…
Position an Attachment at the End of the Email in Mac OS X
To set Mac OS X Mail to attach all files for a message at the end instead of inline with the message’s body content:
+ Open a new email screen in OS X Mail.
+ Click Edit on the menu bar and select Attachments.
+ Make sure Insert Attachments at End is checked in the menu before you add any attachments. If it isn’t checked, select it.
Mail in macOS setting the attachments option.
+ Select Format > Make Plain Text.
+ Write the email with attachments.
This procedure sometimes doesn’t work, for reasons related to how the Mail app composes messages under-the-hood. If it doesn’t work for you, or you don’t want to sent email in plain text, try clicking and dragging the attachment to the bottom of the email, or manually place all the attachments at the bottom after the text is written.