Using swaks standalne script
swaks git: https://github.com/jetmore/swaks
curl https://jetmore.org/john/code/swaks/files/swaks-20201014.0/swaks -o swaks.sh
chmod +x swaks.sh
./swaks.sh --from <from-email> --to <to-email> --auth-user "<user>" --auth-password "<password>" --server <smtp-server> -tlsc