It is impossible to have all the fonts that are available. Therefore it is recommended that you outline your fonts before saving as a PDF. It is not possible to do this in all programs, but if you can, it would be appreciated.
If we don’t have the font that you have used and you have not supplied the file as a PDF, the font will be substituted with a default font when opened. Supply the font by attaching them to your email, or list the fonts you have used. Default Font substitution will affect your layout.