• 

  Columba 3 Jun 15

• 

  Sylpheed 22 Jun 18

• 

  Zimbra Collaboration Server Appliance 12 May 15

• 

  ZMail 3 Jun 15

• 

  MrPostman 3 Jun 15

• 

  AtMail Open 14 Apr 15

• 

  Horde Groupware Webmail Edition 28 Sep 15

• 

  Hastymail 11 May 15