435 unable to authenticate is error when send test mail via email server
This error is prompted when you are operating something？
I guess your account password is wrong, try resetting the account password.
I have tested several servers and can send mail normally.
please try to recreate the user or reinstall the mail server
can send me your email id i will share ssh
This is my email address
now getting preparation fail error after reinstall and adding domain in mails server