Delta Chat version
A message in a DeltaChat group should be signed in the Mail-subject with <Chat: Groupname: Message> to can be moved to the DeltaChat folder and show up in the messenger.
A message in a DeltaChat group send with Verion 1.2.1 has just the Mail-subject <Re: Groupname> and will not be moved correctly by other members of the group.
Steps to reproduce the problem
- send a message in a DeltaChat group with the DeltaChat messenger version 1.2.1
- check the mail-subject with a standart mail application