title: IMAP - editing a draft or existing message?
body: <p>For those of you familiar with IMAP - If I retrieve a draft message (or any message for that matter), and I wish to update it / edit it, what commands should I use?</p>
  
  <p>The only command i've come across is <code>Append</code>, which appears to only insert, meaning I would have to delete the previous draft from the mailbox?</p>