As of 2012, enriched text remained almost unknown in e-mail traffic, while HTML e-mail is widely used. Enriched text, or at least the subset of HTML that can be transformed into enriched text, is seen as preferable to full HTML for use with e-mail (mainly because of security considerations).
At present, it's rare to see enriched content in email messages, whereas HTML emails are commonly employed. Enriched text, or the portion of HTML that can be converted into enhanced text, is considered more suitable than full HTML for use with email, primarily because of safety considerations.