@hacker26
The proper way would be Microsoft’s own tool to create a WIM, otherwise I once tried (without much success 😞 ) https://www.ntlite.com/, you can google for instructions on how to use it.
@Hacker26 if your sending from gmail/gsuite make sure you have verified you own the domain with google postmaster in postmaster.google.com once it’s verified your emails won’t come to spam