Connect to Mail:
It is not possible to set the subject of an e-mail as the file name for a document that should be archived.
Connect to Mail:
The option "Automatic Numbering" doesn't work in combination with Connect to Mail.
Download Hotfix:
https://dwsupport.blob.core.windows.net/supportdownloads/hotfixes/6.10/DW6.10_Hotfix31.zip