Be aware it's not safe to email sensitive files like tax PDFs and *.taxYYYY data files in unsecured regular email. They contain all of one's important personal info and possibly even bank account numbers. At a minimum, one would need to password-protect/encrypt such a sensitive file to ensure only the authorized receiver can open any file and not any miscreant that happens to intercept it. Another possibility (and one I'm not familiar with) would be to use one of the secure encrypted file-sharing products, some of which use a cloud account.
