In other email programs on the Mac, you can easily get a preview of PDF’s and other attachments, just by selecting and pressing spacebar.
In eM Client it seems one has to Save or Open.
Quick preview using macOS builtin Quicklook would be a great addition to a great app. 
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Here is a thread on the topic which would also be relevent for a eM Client Mac version as well as eM Client for Windows version of a "pdf preview built-in) similiar if possible to how Outlook does it. See the second part of thread.
“Preview and print attachements”
https://forum.emclient.com/t/preview-and-print-attachements/71315
Thanks! I thought maybe opening a separate request for macOS would make sense, as the OS provides an extensive/well-working framework for this (quicklook). 
(And I never liked/used Outlook very much.) 
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I would publish some news about the MacOS quicklook feature. As you know, the quicklook is the capability to render a preview of a file without open it. Is really important to understand that the quicklook feature applied to an EML file work only if the mail is export without the CR at the end of of the lines.
The cause of the problem
When the CR is added to the lines, the quicklook feature can’t render the preview correctly and you will see only a blank windows with some details of date, sender and subject such the following image.
The same problem has affected the popular plug-in “IMportExportTools NG” of Thunderbird that has a specific function to remove the CR from the end of the lines. The following screenshot contains (in italian) the command.
So, in many case the mail clients put CRLF at the end instead Apple Mail use only LF.
Possible solution
Now, a possible solution could be to remove the CR from the end of the lines such as “ImportExportTools NG”. I made a video-example about the “manual” solution.
