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Это письмо отправлено почтовым сервером yandex.ru.

К сожалению, мы вынуждены сообщить Вам о том, что Ваше письмо не может
быть отправлено одному или нескольким адресатам. Технические подробности можно найти ниже.

Возможные причины недоставки указаны по адресу:
https://yandex.ru/support/mail-new/wizard/zout_send/not-got-report-yes-other.html

Пожалуйста, не отвечайте на это сообщение.

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This is the mail system at host yandex.ru.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

You can find the the possible reasons of the undelivered message letter here:
https://yandex.com/support/mail-new/wizard/zout_send/not-got-report-yes-other.html

Please, do not reply to this message.


<mamontwise@gmail.com>: host gmail-smtp-in.l.google.com[64.233.164.27] said:
    550-5.7.1 Unauthenticated email from mail.ru is not accepted due to
    domain's 550-5.7.1 DMARC policy. Please contact the administrator of
    mail.ru domain if 550-5.7.1 this was a legitimate mail. Please visit
    550-5.7.1  https://support.google.com/mail/answer/2451690 to learn about
    the 550 5.7.1 DMARC initiative. a69si549186lfa.176 - gsmtp (in reply to end
    of DATA command)

Статус доставки:

Reporting-MTA: dns; forward12p.cmail.yandex.net
X-Yandex-Queue-ID: DDDEC20CB2
X-Yandex-Sender: rfc822; shop@copperguitars.ru
Arrival-Date: Sat, 18 Feb 2017 12:53:08 +0300 (MSK)

Final-Recipient: rfc822; mamontwise@gmail.com
Original-Recipient: rfc822;mamontwise@gmail.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 Unauthenticated email from mail.ru is not
    accepted due to domain's 550-5.7.1 DMARC policy. Please contact the
    administrator of mail.ru domain if 550-5.7.1 this was a legitimate mail.
    Please visit 550-5.7.1  https://support.google.com/mail/answer/2451690 to
    learn about the 550 5.7.1 DMARC initiative. a69si549186lfa.176 - gsmtp