if the file is attached, i usually just download it to a file on my harddrive. i use I.E to browse email so im not sure about email programs. try clicking on the attachement and see if there is a save or download option.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?