How to overcome problems with authorization on smtp.yandex.ru when sending emails?

Question

Email

Good afternoon.
Since yesterday I've been seeing problems with sending emails via smtp.yandex.ru for a domain registered on pdd.yandex.ru
Authorization is denied for logins like [email protected] At the same time, there are no problems
for "native" user @yandex .ru mailboxes.
Can anyone tell me what is the problem / how to solve it?
Thank you.

Answer 1

feedback2.yandex.ru/mail/send/smtp/password/?from=pdd

Answer 2

Write to them in support, they will tell you more precisely.

Answer 3

Do you write the entire SMTP login as [email protected] ?