Why can't I authorize msmtp in Yandex.mail for a domain?

Question

Email

Hello!
Can't send emails via msmtp. The credentials for traffic rules in the config are correct, using them you can successfully log in through the web interface or email client. Moreover, if you specify the data from the mailbox on yandex.ru, then the letters are successful, i.e. it is not possible to be authorized specifically in mailboxes of traffic regulations.
Config:

account default
logfile /home/bitrix/msmtp_default.log
host smtp.yandex.ru
port 587
keepbcc on
auth on
from <адрес пользователя>
user <адрес пользователя>
password <пароль>
tls on
tls_starttls on
tls_certcheck off

Answer 1

Got it!
From technical support came the answer: “Since last year, we support work only on a secure protocol. You need to specify port 465 and enable SSL support. You must specify the full address of the mailbox as a login.
Edited the config, it turned out:

account default
logfile /var/log/msmtp.log
host smtp.yandex.ru
port 465
from <адрес>
keepbcc on
auth on
user <адрес>
password <пароль>
tls on
tls_starttls off
tls_certcheck off

Answer 2

Make sure that access for mail clients is enabled in the account settings in the webmord.