dead.letter file

Hi,

teamviwer is writting a dead.letter file which as far as I understand is to do with mailing.  We haven't set anything to have emails send with its status etc. Anyone else had this issue, or can shed any light on it? 

running:

• teamviewer 15.6.7 (DEB) 
• pop-os 19.10 
• kernel 5.3.0-7648-generic

The message it trys to send in dead.letter is: 

Init...
CheckCPU: SSE2 support: yes
Checking setup...
Launching TeamViewer ...
Launching TeamViewer GUI ...