Ok, I found a solution by myself.
- Create a template and save it as a .msg file. Mark variables as variable or or as you like.
- Close Outlook.
- Open .msg with run-command (WIN+R) - simply fill in your full path to the file and let the bot press “ok”.
- The template will be opened so you may edit subject, body without touching the styles. I used CTRL+H to replace variables.
- Let the bot open outlook to send out all mails
For me this works pretty fine.