Igonring the social dimensions.<p>From an information theory perspective, the lack of redundancy may be problematic, particularly if email is a noisy channel. Because hitting send writes to &quot;permanent storage&quot;, typos &quot;are forever&quot;...and correcting them adds noise.<p>For example, I accidentally send &quot;1w&quot; when I meant &quot;w1&quot; versus &quot;Will get bcak to you in one day.&quot;