When you “print” an email, the “Save As PDF” option becomes available. A well hidden feature. This should be possible in the menu somehow as well. Besides that, the feature is not working. If I press save as PDF, i get the dialog box, where I want to save the pdf. After choosing the path/folder and hitting save, the dialogue box disappears, but no PDF file was saved.
Hit cmd+p on macOS to print the email or get the hidden save as pdf feature. Choose any path/folder and hit save. CHeck the folder for the pdf.
Save as PDF should be in the main menu AND it should actually create / save the pdf file