Believe no, that will be different generated by smtp provider in this case timeweb.ru once you have smtp setup with them that will tell you the SMTP port, username and password.
No, is (usually) password generated for smtp by e-mail sender not regular e-mail account password.
Let’s Encrypt account email you can skip or set that to different e-mail for that.
To verify reccomend you contact support with the mail sender you are using, there is also a support article here: