Why does Yandex mail not allow sending letters?

Question

Email

Hello
There is a domain mail on Yandex, DKIM is connected.
The site sends letters with the creation of an order on the site / registration / password recovery
As a result, Yandex issues a ban for 24 hours for spam. What could be the problem?

SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: [2] Message rejected under suspicion of SPAM; https://ya.cc/1IrBc 1499508144-mO8p8wojGx-2Nq8KJrj SMTP code: 554 Additional SMTP info: 5.7.1

Answer 1

Don't spam and you will be allowed