[Hanyult] Mail delivery failed: returning message to sender

[Mail Delivery System]

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  ekoartdeko at yandex.ru
    (generated from info at ekoartdeko.ru)
    SMTP error from remote mail server after end of data:
    host mx.yandex.ru [93.158.134.89]: 554 5.7.1 Message rejected under suspicion of SPAM S6J8q01X-S6JC6hNC