title: Thunderbird: emoji covers my mail
body: <p>Good evening,</p>
  
  <p>i've just installed thunderbird on my ubuntu and imported the mailboxes from another linux distributions and when i open my default mailbox some mails are covered by stickers as in <a href="https://i.stack.imgur.com/ZDfnu.png" rel="nofollow noreferrer">attached image</a>. How can i solve this issue?</p>
  
  <p>Regards,</p>
  
  <p>Gunnar</p>