Make SMTP TLSand authentication optional for SMTP

Hi,
I am using kopia in an environment where the “internal” SMTP server (not controlled by me) does not support SMTP AUTH. Also, it seems that STARTTLS fails sometimes.
Would it be possible to have SMT AUTH and TLS optional?

Issues for this request were opened on Github already, but I don’t know if someone is willing to work on it at the moment.