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A message that you sent could not be delivered to one or more of its
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***@ngs.ru
(generated from notification-out@velo.nsk.ru)
SMTP error from remote mailer after RCPT TO:<***@ngs.ru>:
host mx1.ngs.ru [212.164.71.11]: 591 your host [213.234.249.39] is blacklisted by dnsbl.njabl.org, details at http://openrbl.org/.

проблема устранена

213.234.249.39 was not found in dnsbl.njabl.org.