I don't understand. Are you saying you can't send your letter done in publisher as an attachment? Could you not download one of the free pdf converters and send it as an attachment as a pdf file? sorry if I've got the wrong end of the stick here.
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 ?